Document 1Qre1Xjp8bKRO62XDNYLLk8wd

Jn EMBER 19SJ quarrying industry "U.g.j.fM o'i Better Things for Better Living ... through 0 'j& -MM mis try #rM1 S1n;47M'A Witiih1 ffm11i, <>1fi..i It's the color that adds beauty to the fabric. Garments made from these fabrics will rate high in eye-appeal, hut the life of the garments will depend on the life of the colors. Excellent fabric and correct styling mean little if the garment is ruined by fading colors. Colors must keep their fresh, new look through repeated laundering, city cleaning and exposure to sunlight. When Du Pont vat and other fast colors are used in dyeing or printing, the color stays in the fabric. No matter what your dyeing problem may be, call on Du Font's Technical Staff for assistance.They will help select the dye for your fabric that will give full color satisfaction. E.I.DU PONT DE NEMOURS & CO. (INC.), Dyestuffs Division Wilmington 98, Delaware BETTER THINGS FOR BETTER LIVING Through Chetnistry AUGUST SEPTEMBER 1 f S S llu often say I hat Hit- chief eha rad eristic cf modern industrial research is teamwork. We speak of a lean* of research men and women pooling I heir talents to win ;m objective, And at, J)u I'out we are proud of I he rapid material progress this Kyntoni has achieved. Yel in stressing the team we must remember I lie individual. We musl remember that new filings are the result of new ideas, anti flint a really new' idea fakes shape in the brain of only one man. We, wore reminded of this a low weeks ago by I )r. James B*. (Tamil, president of .Harvard l.iniver.siiy. who spoke at the dedication of Du Bout's enlarged i'jxperiiiieiil.nl Station. 'The revolutionary adv.-mere in theoretical Bekmce, on which mir presold technology is based, were made largely by scientific amateurs, the educator said men lilte Priestley, Faraday and Lavoisier who were ``as free as the wind because they bad no program except, (lie ever-changing one in their own heads," These men are gent!, and sucl) modern directors of research as those at Du Pont have taken their nlaee. This marks a "drastic social change" which we musl accept without giving up the progressive ele ments of flic old system, said Dr. Cramnl. Today's industrial executive "must somehow eonI inue to produce the equivalent, of the lone inventor; lie musl: have some individuals in his outfit who are almost fancy free." The visitor from Cambridge said lie believed the American -people would be wise enough to support the uncommitted investigator in science, and that, indus trial rivalry would keep Hie "spirit of invention" at a high level. With freedom of inquiry and freedom for the gifted individual to follow his own peculiar genius, the rate of new discovery will assure continued prog ress in applied science, lie indicated. "I for one place my bel on freedom," he con cluded. "and if is for this reason that i rejoice wilh those assembled at the dedication of this laboratory." (giro BETTER I MINGS FOR BETTER LIVING...THROUGH CHEMISTRY .1 S.M I - S II. McE a HI MICK, i ttiior yil, 45 4 ft-Mhm's, m a li <; a 11 i ;t m i n k n GOlUHliN II, k I'fS'l'Lli ill'll CWVlslts We read the other day I fiat quarrying is sec- end only In agriculture as the most widespread industry in the United Kl.nls, The oldest use of stone, flit* book said, was in bitleks lor building -ami we vis ualizes! |.he temples of ancient I'lgy pi and Mesopotamia.Today si one is broken up into smaller pieces Cor use in construe! ing itnil flic like. I Ires I, quantities of quarry prod- mis go inlo making such tilings as glass and iron. Thu quarrying industry is close to tin* heart of Du Boal, llmugli, for siiII another reason, H, is liter ally one of the (lompniiy's oldest customers, On Boot was h I ill an iiifanl when its explosives were firs!. used to blast the stone needed for a building nation. hVw quarries I lien or now, however, ever Ik lasted such mulli colored stone as llial cm the first skelclies of our magazine* cover. Our quarry' experts took cxcn-tly four seconds to tell us to tone down "those -------------red and green shades." 1'tiblir.ht'd imd rnityntiblcil 1 `>5 3 I y 1C. 3. hi l'mil <k JNenioimt v. Co. tine,). Wilimmibin. Dcluwarr. Ail nnhls rt-:>crvctl. Tiih or ;mr1 r. thrrr:H rmiy nnl he rriiroiluurd in /my idmi willionl in'mib-Mnn in writ ink Irom lbe publisher. PHOTO CREDITS: Pm;e lb b> lU-i-.u. cmn teov Hubbard I'm ms; Pune 12 ,md Viyry Id, top: rouiicby A .'rf.-Droil Plying P'nromr .:inv; Pj ij u 1 Id. ImlUuu: coinlruy b'tntl M>U >r Co.; Ph ix c 15, top: i-omtmy Spwrs y 1 *vf *cIt wt s, 1 m;.; Pnp.e 1 >, 1 ic-1 i 010 1 `niii 1 Ptvy Pfti\ jr/omo SumP-iy Jc-ifrn.'il; IDip.rs `>0 >md .`1 : li. A.rmsl rimp Kuhcit:;; Y*:ik <- Al. t`P m\Ul : .-1 inilexy G'lodvciit Tii t: &. Rubber O's, Piute di;couiles.v B. K. Cn* nil i<:h C".; Paste XM omrlerty Cidnu C; nfl s. ln<- M A blaster load* drill hole wiili charpw of "lNiIrninon" in preparation for hlasiinrv. Breaking rock down to manageable size Is the. job of the quarry man. lie shutters trulls of solid stone with the flip of a switch --mid flu l*ont " Nitrannm" My II. A. EAIilCH The United States, blessed with it vigorous people and the breadth of a continent to grow in, has never slopped running to catch up wir.h itself. Its citizens have never been able to say: "We now have enough homes, enough schools, enough roads. enough da ms, enough bridges. .Let's stop building for a while." The second World War worsened the sil tun ion. Civilian construction slowed ton crawl while the nation concentrated on winning' the war. Anri In complicate matters further, the population grew faster than any one had anticipated. With the war behind it, the country was (breed to ntn faster than ever, llelurniitg CTs and Iheir families had to be housed: the 2,000,000 miles of surfaced roads criss-crossing the continent needed repair or replace ment: work wan rushed on tong-post ported Hood con trol dams and bridges. Tliin eonsl.niel inn boom hay laid heavy damnads on Hie no! ion*:-; quarries. (i ravel for road surfacing, heavy rook for mad base, and crushed slonr for con crete an: vilal ingredients in ihu const rueI ion formula. To meet I Ik ; demand, more limn 100,000,0(10 funs of crushed and broken si one. valued ai. upwards of 31 fit) .000.000, are hauled from (.lie pits yearly. 11. takes a kit, of energy to knock loose I list much rock,ami the quarrying industry has been using Du Pout bins! mg materia Is for a long, long I irne. Today one of the must .important of these is "NilramoiT blasting agent., outstanding for its safety. One day recently a photographer and a lhi Pan! Magazine reporter visited the 20-acre pit. of the Su perior Stone Company at Kings Mountain, t he largest commercial limestone quarry in North Carolina. Out of this gigant ic hole in the ground flows up to 000 tons of crushed stone an hour, most, of* it for use in highway const ruction. Two blasts were set off at Kings Mountain (.hat clay. In each one a wide segment of Hie 100-foot-high tiniest one face was shattered and sent t hundering to the pit door with a charge of "Niframon" ;\. which I'.ad been loaded int o well drill holes 16 feet, hack from the face. The.shots were fired with "Niframon" primer, `TrimneorfT detonating fuse and electric blasting caps uf intervals of .015 second between holes. The shori -interval delay firing* with a 1 hi hunt, blasting timer kept vibration to a minimum. The re porter, watching from I.lie rim of the quarry Jess limn a half mile from the blast, scarcely felt: the shock of the explosion. There was little back break and good fragmental ion, Carl Mayes, a quarry man lor .`Ml years and at. present superintendent. of the Kings Mountain quarry. pointed on! two distinct, advanlages of "Nil ronton": it ;h safer for his men to handle "they say von can fire bullets through il. without, setting it off, all hough wo haven't fried that'' and il, doesn't produce headaches. No sooner hud the dust set tied on the blast scene than a column of diesel dump (nicks, led by two power shovels, mewed in toward the 4tU)nO-ton mound of shattered limestone. The shovels scooped rock info the trucks, which roared up a slight incline to the crusher and dumped I heir 18-ton burden into its grinding depths. The crashed stone (lien mover! out of the pil. on a conveyor hell. After being washed, tl was loaded into trucks and railroad cars at the surface. In the background of this activity, silhouetted against, the afternoon sky on the rim of the quarry, were two drill rigs of (he type used in oil fields. Their whirling bits chewed down through the limestone at (he rate of 10 feet an hour, making way for the next charge of "Nilraruon" amt the next blast; that, .keeps the quarry producing...and I ho builders budding. Notary drills working on rim of kings Mountain pit drilling hobs into which "Niliannm" will br load ml. 1 ihiti.M?.tmI tons ot linK'shmc lircuk a k a ^ from rfifl Ji- liar?.?!* ik fin'd. 111fT< of biiioki' mark drill lmh*s. Trucks and power shovel move in niter blast. Much of this limestone rues into highway rouslriiclion. The mitltlleireight ehtimpiott of met a In routes elttser lo full-settle ntttntt ftiehire tis I hi Toni opens a note plan! at A'Vr|>rl, Delon tire Writing about the current status of titanium metal is like taking a snapshot of a Thundcrjel on the takeoff. it's likely to be up and away before you get if in your si gilts. In recent years now alloys and new production techniques for this metal have been stepping on cadi other's beds. New uses, from discs for metering gauges to heavy compressor forgings, are leaving the blue-nkv stage and going into production. This rapidly changing picture is largely due to defense requirements. Of the ligliter-tliarr steel struc tural metals, Unde Sam is casting the most hopeful eye on this one. As an Air Force general has slated, titan ium has no equal in a combat plane. It is much s(.rouger than aluminum alloys, and can operate at higher tem peratures- - but is only about half as heavy as alloys of steal. Alloys of titanium rank, with many steel alloys in strength. In (lie new metal the Navy sees a silvery lining, (.0 marine corrosion problems. Generally speaking, (Itan ium compares with stainless steel in corrosion re sistance. But in contact will) salt wider, it perforins better than almost all other metals and alloys. Kver since 19-10, however, when U. S. Bureau of Mines research stimulated industry's interest in ti tanium, the metal has been in short supply. As mef ids go, it's still pretty expensive at S;1 a pound. This situation is taken for gran ted., of course, in the early days of a useful mol a I. Only 0! years ago, Charles Martin Hall was .starting electrolytic production of aluminum at, coincidentally, just So a pound. But the .national emergency has (dreed infant titanium to urn I are rapidly. If is already a robust adolciiccni., with mass-production adulthood in sight. Du Pout's I hg! nonts Department has been working Pictures above show induction furnace (left) tint! arc furnace (right) on their upper levels. Here sponge is charged for melting. Lower levels of fitrnnees appear below. Induction mode! makes single ingots op to 650 pounds; an*, furnace casts continuously. steadily to husl.cn tlt<: day of largo-Kcub operation Hr first pilot plant started in duly J `.MB at Newport, 1 )elaware. By September of flint year, when limited amounts of the metal were announced, demand began out running supply at a fantastic rate. Oufpul. was only about 100 pounds a day. To boost; production, two larger units of bef l.er design were installed. All three units have been operating around-tht'-clock ever since. Last April the Company look its first big step toward quantity manufacture. A new plant at; Newport went into production on a Hemicninmercial scale. Its capacity will be(M)t) Lons a year. This graduation from poundage to tonnage is the "first long punts" of a new medal. The new plant is expected to reach full capacity early ill 1952. Even then, however, it will continue to be used partly fin- experimental purposes. Research on titanium production requires this. Much of the progress to date has come from pilot plant experimentation. During these research studies l)n Pont men have spent considerable time working on melting methods. Roth furnaces arc large? enough to approach real commercial proportions. In one more; than .15 tons of metal have already been melted, and alloy ingots up to (>50 pounds arc* now being east. Six such furnaces are now under construction or in operation in Hie me hi Ik industry, and one fabricalor reports preoaring ingots as large as 1,000 pounds. One of the new furnaces, based on arc heating, may hold a vital key to the continuous mell mg and casting of titanium. If, was the first piece of consolidate ing equipment in the titanium business to have this advantage. In it ingots can he formed continuously from molten metal, then cut to suitable long! I is. Once in ingot form, titanium is rather easily handled. Among the companies (.hat have worked with it Hiiccessfully are Uem-( :ru Titanium, Inc., Mallory Sharon Titanium Corp., and Republic Steel (-orp. As sponge metal becomes available in larger ipiatilitios, they have been turning it Into a variety of sizeable semifabricated pieces including .sheets, strips, wire, rods, tubing and forgings. Symbolic in<'ts show llic ratio of str'ilh to wvfelit of various, alloys anil |ire lil.mmm. Note Oi.wUiOU .Ufa..... ,i V. \ U i S _ i O': i i i ' 1 i .1 i 1 ' . ILi'C . i f V r I 1Ui.O: i i i ; ; 1: ' U: i |s. Siainln-.s Stool 302 THanium Aluminum 75 51 Alhy Magwstum AM,'C57$-H Allay A Titanium AUoy For freshly turned out titanium, as sold by the Comparty, is in sponge form and resembles gray coke. Be fore customers in the metals industry can turn it into barn, sheets and the. like, it must be consolidated. To do this. Pigments Department research men have designed two special furnaces for melting sponge and converting it into ingots. The design of these furnaces has been offered to titanium consumers as a technical service, since Du Font's primary inleresl is basic metal production rather than fabrication. The chief complaint from processors is: "When do we get more?" The (rump cards here are held by the govern rue of.. Even though output of the metal in creases, defense requirements will siphon all of It off at least for the foreseeable future. Those titanium fishing rods, window frames and dishwashers, corrosi on -res isla 111. vessels for chemical manufacture, high-speed spindles for textile mills, and dozens of other likely peacetime applications will have to wait. i*4i4 iViaL <x iU:%v iii.M-rhrHtr iini.Hi |i i\ I .tiler, lux ii-ologii-iil elmlii*,i lid |t ili-lcrmiiir hew M> handle ll This tieiv product is helping cut dtnrn the tint ffindIfion-dollar bite that. insects take oat a f farm crops each vear A new insect killer has turned up this year in the eropproleclbn manuals of slate colleges. Turning the pages, for example, of the 19I TSpraying Program for Commercial Kroii. C !rops" of Ohio Stale University and I ho Ohio Agricultural Experiment SI at ion, you'd see EPNTOO insectbide recommended as an ii igroclioi11 of sprays for apples, plums, primes and peaches. The concentrated research that bunched KPN began back in 1947, when Du Pont onlornnlngists ami biological chemists were looking For a in i tickle -a chemical Unit kills 1 lie lough mites. They knew' that the organic phosphorus family was a likely place to look. So they intensified their si utlies of such compounds. What they winded was one (lull would kill the pests, and last tot: a long lime off or application with lire least possible toxic hazard. Of the scores of chemicals screened, EPN looked best. It was a lopnotch milieide with an excellent re sidual effect. Like its organic phosphorus relatives, li was poisonous. It was somewhat less hazardous. lunv- t*ver, than some other compounds already in com mercial use. Before KPN went on the market, it had to go i hriiugh I lie many development steps required of all Du Pont agricultural chemicals. Among them were greenhouse tcsls, preliminary field evaluations, marked surveys, and experiments by federal and slate invesi igalors. Labels had to be approved by the CL S- Departme nl of Agriculture. Si tidies were made of the behavior of ETN residues on crops, and of its acute toxic prop, cities. Chronic toxicity iests were carried out by the University of Rochester, During 1950. EPN's per formance was evaluated by more than 85 investigators in >11 states, Hawaii. Canada and Mexico. Soon it appeared that; KPN would he a good in seei icicle as well as nuTicicle. Experimental findings are bearing this out. Not only can this product help solve had mile problems, such as plague fruit growers, but il shows promise for routing leaf rollers, plum eurculio, olive scale crawlers. Oriental fruit moth, nut casehearer and many other pasts. Prom research now going on, still more Informal ion wall come to determine Kl'N's range of practical vise, both as a mil wide and insecticide. If, looks like the hugs arc in for a bad time. rt*s<*:<rrli m* (vara vdiivli jn*i*ls tin* killed In <*li-jtti<'!tls. mid which plants nmy be hurl. To find mil irfnit fires snre-fi a rkaged items run like best* and ir/iere y o u Irani la buy I hem, Du Don! is sfionsariiifx nalinnnide market studies H'tien the aerosol bomb was born sonic nine yearn ago, It looked like art infant prodigy with a big future. Fifty million of these handy containers were used during the war'with line results. But when the war was over, the civilian market was something of a question mark, it needed sounding out so that manu facturers, wholesalers and dealers could learn what consumers wan tori. In 1947, Du Pant's "Kinetic." Ckcoskmls Division -- which supplies "Freon" fluorine ted hydrocarbon propellents to the aerosol industry...deckled to go out after the needed market data. From const to coast. it. sponsored surveys covering more than 4,000 con sumers and dealers. After seeing (lie results, Du Pont felt that they would be helpful to the entire industry. They were right. Manufacturers, hungry for data that would help them meed the needs of the public, wen: eager lo get the information when it was offered, Fnl.husiasin ran so high that the surveys were continued annually. By J950 flu; (,'liemical Specialties Manufacturers' Association, the trade association of the aerosol in dustry, asked Du Pont to present, a paper on its mar ket rosea roll at (heir annua! moeiing. If was there that tlx; results of the newly completed surveys go I their first airing. In I,bene 1950 surveys consumers were asked, "Ilow well satisfied have you lmen with aerosol prod ucts?" Over three-fourths replied that they were eomplolely satisfied. In (he case of insecticides (he main reasons were ease of use and effectiveness. Sinning rreiinis now come in aerosol*. Starve)s show nuiiiy |>oi>|il<* waul snell itettir packctl litis wav. A huh why they like aerosol iimeet ic mIc *. liters mi hi "convenient" (30<4), :*tnl `'want clVeetive" (IK'/O- Keplics to the question, "Where did you make your most, recent purcliaseof a i aerosol?" showed t hat food store sales wore: on I he upswing, Drug1, dopan monk and hardware stores are also important outlets, liilurmntiou tike thin helps put aero,sols whore people prefer i.o buy them. Anol,her query, "For what, purpose did you buy your last aerosol?" showed the popularity of various types of pressure-pack a god products. Leading the parade are insect ieirtes and moth killers, litmuchold deodorants are showing an appreciable increase. And many new products are moving into the tit-id. mcludirg waterproofing agents, paints and protective comings I hr silver. Over all use of aerosols is growing, the surveys point out. 11) 19f>0. almost, half of the respondents said they had used them, as against, 27 per cent, four years before. This sternly increase holds true fur all economic groups. With more firms producing aerosols, and with now prodnels on I he market. total sales in 1950 aim Hinted to over dO,000,000 packages. In 1 lie light, of this information, and much more-, Du Font is emit inning its surveys and supplementing them with special ones at its AUan fie City Exhibit. In this way if. hopes to serve the ultimate consumer indirectly, and provide a young industry with a sUnuh ardi/.cd body of auihorit,alive market data. I -Smmiti I. J06 aem>uil f rtrm^ %M-n- ijistrlH'iilrs. room 'i^ocloviiitlK. tit i tl h pi.....icr,>,, A 5>rtH inii iiiiiiiiiio' <uii*r\ prosimi-x like Mill t;m fiitltm. Aot. many years ago most, broilers on I,lit? market, were surplus cockerels or oilier birds culled from laying docks. Their qualify varied widely, the supply was seasonal, and consumer demand light. But today broiler raising is a fast-growing, mech anized industry that added $.150,000,000 to farm in- come in 1950. Experienced poultiymen raise as many as 40,000 birds at a time, repeating i.lte opera I ion four times a year. In 1951 a record 000.000,000 broilers, nearly two billion pounds of chicken meal,, will reach t.hi! American thinner table. At least, three things account, for this phenomenal growth: better management of flocks with a resulting Increase in ofliciency: the breeding of plump, meaty birds ( hat, mat ure early, and tire development of belter poultry feeds. Dn Pont "l)l>lsl,e^)^, vitamin Iwhich is added to poultry feed for growing birds, has played an im portant, part in this expansion. Commercial broilers arc raised indoors, away from flu' natural source of bhe "sunshine" vitamin needed for healthy growth, "I felsterol" ,5s based on t lie research of Du Pont, elu-wisls. who found thafanimal,sterols, iron Haled with till ra violi! light. produce an iTfeetive source of vitamin I >. Chemistry continues to work for the poultryman and the consumer. Broiler growers now are looking for a feed that will produce a three-pound broiler in a .shorter lime at less expense. Du Pont is constantly in\estimating new products that promise to help them reach this goal and continue their record-breaking production, 11m; ttnidi-rtl nylon lirusli reunited Iron! :* tas.dc rUt<B of vlsut *n;*kes a |uinillirnsli jr.iiitU Puslirur research on paintbrush perfoi nianre ho s demonstrated the superiority of nylon filaments in properly made brushes Hy N, AIJIUJCHON A man faced with starvation isn't likely l.u quest.ion the nutritive value of the food offered him. He Lakes what lie can get.. In the Maine way, when (.lie Japanese out off the world supply of Chinese hog bristles during World War il, the U. S. Army and Navy were in no mood l.u wait for the exhaustive tests that usually precede tho introduction of a new IJit Pont product. 'The armed services needed paintbrushes rigid away, and Du Tout, nylon tapered filaments were pul: to use. ready or not. Now trouble with Chinese communists lias again reduced imports of hog bristles. Moreover, current government regulations have drastically limited their use. But (he ,situ,ai.ion on this side of the Pacific is far different,. The experimental work 1,11 at, was by passed during flic* last weir lias been done, and nylon paintbrushes arc backed by both practical and techni cal evidence of quality. It) | Todayfx brushes lining nylon bristles are 1,1 ie result of' development work done in independent research Inboraiories. in the plan Is of paintbrush tnamd'acuirers and al Du run!,. 1 lore's how (he work wan carried on: First, a reliable measure of brush performance one find, minimized human error- had le be devised. Special testing units were built. One measured tire friction between the paintbrush brisl les and I he paint ing h u rface. Another lesf.ed the si illness of bristles. Together, (best* two factors make up what the painter calls "feel." HI ill another device dipped and wiped brushes mechanically. The innsl ingenious machine actually painted with I,he experimental brushes. Teals with this equipment, plus other .research by Du Pont, led to i ,h i s pus i I. iv e eonelt is i o n: properly made paintbrushes with nylon filaments are superior to rbose made with other bridles >l` the best quality because they a re comparable in performance. iasL much longer, and generally cost less. The results of flu-sc findings Hie qualit ies that- make a paintbrush good - have been made available to brush ina mi facial rers. More1 Ulan 25 of them are now pulling these recom mended production procedures info el'feel. Whaf are the features of a well-made brush using KM) per cent nylon filaments? The experiments proved one tiling above all. A good nylon paintbrush should have ils li [aments ground to long, fine lips. 'Fids proper grinding causes a slight curling of i.hc lips as shown in the photomicrograph. This processing results in belter pain! pickup unci release, and smoother application in the finished brush. IHirh paintbrush manufacturer must grind fhefilnmenfs himself, .since they conic to him from Du Pont uugrmmil and not renclv for use in paintbrushes. The tests showed. Loo. that u good nylon brush should contain a generous quantity of filaments. The amount of bristling material is ail indication of qualify in any paintbrush for that matter, and lias an influence on the brush's ability to pick up and release paint. Another tad. turned up by the experiments was that a nylon brush should have slightly shorter fila ments (hail flu iso in a conventional brush, Since tivlon wears buffer, (he shorter brush is no handicap. Also, flic shorter length gives added stiffness, improving ihu "(eoF* of I,lie brush, For example, a four-inch wide Shi,.hi curl nt tip of in Ion lirtKtloK ill right K sign ni qiiiilil). Finch ground iihimi ills pick rip more paint, ;ip|)h it more ovenh limn lln- I limit lirisllcs nl ihr left. nylon brush should have no more than -1,--j inches or brisf le extending below ilie ferrule. li was made clear, `too, ihat only nylon should he used in a nylon brush. If a brush contains a mixture of nylon and some other material, the latter may wear more rapidly and leave an unbalanced brunti. Nylon wears three to live times as long, for instance, as hog brisfles. 'The lype of bristling material in a brush is stamped on the handle and if isn't nylon unless if snvs so. The result of (his 'postwar research and develop ment sponsored by Du Font is one example of how a large* company helps smaller businesses. Today, paint brush innnuf'aefurers are in a position to make good brushes from domestir mnTrials...to the benefit of everyone who buys (hem. ittrrliaiiHMtl puintfi- tV'Iril pailll rupucilv of brush*':-, pru\< <1 need for liriniiiiig in (on tilniiinils prupi i fv. i Dm H-r slim* it ;ilim i- anil Isi'hm iiu`asur*s slilliwxs >|`||a* liriM les. This i- pail of hat I Ilf - puinlcrs call "feel.'" 1 Agriculture is httsv these flays sprouting a t hi ifI dimension, F.nemt raging the new trend lowa rd aerial tiperatiuits h the National Flying Farmers (ssoriotinn ay : min mr In Nevada, a light plane skimmed over pasture lands. Now unci then a white block dropped to the earth... salt for the livestock grazing near by. Tn Texas, two men spotted a stray heifer from the air. One nudged the other and said, "There it is. Guess I'll come up tomorrow and look for breaks in the fence." In Ohio, a I,lut'd plane circled as a man and Ids wife studied the kind below. "That farm's not such a good buy after all," he said. `Took at. that erosion over there." All o( these people have two things in common, agriculture and the airplane. They're among Lite 5,000 odd members of the National hiving Farmers Associa tion, an organ izatioi i of farmers and ranchers that had its beginnings at. Oklahoma A &. M College in 1944. A Small group of (armors wiill a mutual interest in (.lie airplane as farm tool founded their local organization there. Two years later a national association was sol. up. `Today there are Flying Farmers in >17 stid.es, and a movement is even under way in Alaska The National Flying Farmers Association is cur. renfly sponsoring a number of import;ml. activities, including the agricultural aviation studies undertaken by it.s own research foundation. But the grass roots of the association is the individual farmer. -<My plane is just as essential as my tractor." says Roy Frunkenberg of Purcell, Oklahoma. "I use it for supervising farming operations in three different places, nuHiding up strays, going Lo stock sales, and getting supplies quickly. 1 take i;y daughter to school in it., drop feed lor quail, and lake farm boys up to set; their lands." More than once Fra n ken berg's plane has gotten him out of a tight spot. (In one occasion, a hay baler broke down in the middle of liarvesting. The nearest repair parts were 60 miles away. Rut, using his air. plane, he had the parts hack in the hay field in an hour mid fifteen, minutes. Del Fuhrimnn, a Utah Flying Farmer and field execut tve of the national association, expresses his feel ings abou fair age agrtcul Lure with the word "freedom." `The automobile helped free the farmer from his rami isolation," says Fuhrimnn, "but the airplane does much more, `Fake me, for example. I'm a farmer. Rut I've lost that sense of belonging to one spot in Utah. If I wont to attend a meeting in Chicago, 1 just Imp In Prom friendly visits to liauliiig icpair jinrls in a liurrv. :t Flying l` ni'nlrr"* |lnn- g!v`s him avertin' mobility. my plane, iviy win: mk i'h nt uy ana j ih k c ner main;. Later. on the farm, we reminisce aluml Thai evening in (ho Pump Hoorn. Flying fanners are community conscious people. One evidence of (his is their interest in local and statu .soil conservation. The airplane, of course, stimulates tliis. For the fa m tor-w i Id 1 a -; > la i ie is used to going up a few thousand feet, where he can see a large area at a glance. From this vantage point he observes erosion, contour plowing, surface water supply, and crop prog ress, He realizes that his own problems fie in closely will i tin* a grit util urn: problems of his entire area. Mass soil eoiiservalttm flights are regularly spore no red by flying Farmer groups, in Oklahoma, i'or instil nee, over 1,100 persons were l i ken on flights to view soil conditions in one year. Ohm fanners also take an aidive part, to trmss air fours. Such lours often give old-timers their first excuse for getting near an air craft. One OH-year-okl, while being helped into a ship, put il this way: "If you fellers ain't afraid to take one of 1 hose things off I he ground, I'm sure n;it afraid to ride with you!" Bearing mil I Ids oldster's zest for the new, most Flying Farmers are not padieularly young men. Us ually they're experienced farmers - good businessmen who see in the airplane a way to improve operations. Another el ut racier* is l tc of the Flying Farmer is Ids helpfulness in emergencies. Flying blood (o isolaled sick persons, for example, in another case, during the terrible Western winter of tin; "hay lift.," Del Fuhriman was flying his ski-equipped plane over Utah, cheeking on snowbound sheep herders. IBs only natural, therefore, that the Nat iunal .Flying Farmers Assoeinl itm was one of the (it'sI. or ganizations called upon by die National Emergency Aviation Council to submit plans for the current civil defense program. Today the farmers stand ready to serve in a dozen ways. All in all, we of the chemical industry have a lot of admiration for the Flying Farmers. And we supply Tr.\ Atulrrsmi of "S PFA is seen holding raltiiflrr Ihltig il over tlio Chisholm Trail in I hours as a ehsirilv slont. I )hllimers jiiriin tal once look ) months lo drive herds across. them with many products. Not. only fertilizers, in secticides, brush killers and oilier agiirultural chemi cals, but chemicals specifically designed for petroleum products used in aviation. Such products include gasoline dyes, aidioxidams and lube oil additives. One product in particular is common to a linos! all of their operations t he fluid that. Increases l lie anti knock rating of aviation gas olines. Du Font's mdatiou grade Tetraelhyl .Lead ('ompouml, for example, has been an unseen passenger on thousands of Flying Fanner hops. 'TEL is even more imporlant to the professional crop dnslers and seed broadens!ers. These hedge hoppers, hired by Flying Farmers to dial rtbufe chem icals bv air, generally use larger planes (.hat can carry lienvier loads. Oflen (.hey have lo awing low over a held, and at the end of it zoom up suddenly to avoid obstacles. Reliable power is essential. So, whether it's used by the farmer himself or his serial allies, TEL is an important footnote to the new chapter being written in the history of both aviation and agriculture. For aerial swlinp; awl crop treating. Flying ITirmers normally call on commercial concerns like this Arizona one. Tracking (hum hidden dejects in rails is it juh of' Sperry Hail Serried. Last year, they turned tip (tfiJNHI jimrs that cmdd hum endangered your safety At, M anehoster, New York in 1911, a train careened off the track. Twenty-nine persons died, nnri more ilniii 60 were badly injured. I n J92.1), another 21 people lost their lives in a similar disaster near Victoria, Mississippi. In each case the cause was a broken rail. No one bad, or could have, seen that there were trans verse fissures in these rails... internal defects that grow and spread. As late as 1947, broken rails, caused by this "mil cancer" and other flaws, were derailing 1,000 trains a year. Nowadays such failures have been enormously reduced. Much of the credit goes to modern testing methods, such as (.hose used by Sperry Products, Inc. of Danbury, Connecticut. By an electronic technique. Sperry can "set:" internal defects without removing the* rails, without making a scratch on thorn, and without disrupting normal traffic. This is done by a Heel of 20 detector cars that, travel continuously over (tie I,racks of more than 100 railroads. Last year these ears cheeked 160,000 miles of track. They found 66,000 defects so serious (.lint rails had to he replaced. The Sperry Rail Service car, will) its bright yellow "Dulux" enamel finish, looks vaguely like a passenger coach.. until you take a close look. Then you notice the ('leefrienl apparatus slung on iks underside. This equipment includes broir/.e "brushes" that carry electricity from the car's generator to energize the rails. Thou sea rolling coils scan the magnetic: field about the rail to pick up distort ions caused by internal Haws. Volfag<*s generated in the coils arc* amplified to trigger automatic pens in the eon I ml morn, and put a. jiggle in the hues they're drawing on a slowly winding tape. in me fiame automatic manner, paint, guns squirt a bin!) of pa inf on any bad spots in the rail. When the Sperry crewmen find a flaw, they go back for a retake, just, to bo a.ire. Sometimes tf.V, nece,->eary for l.tieni to }.:e(. out and use a hand (,eater. Tins device spots bad flaws inert; exact !y. and lulls hew much old he area inside the rail is affected. Then a code mark is wrilton on (he side of the rail. Railroad main tenance crews, followin'.; dose behind, can see tire niecliafely wind's wrong and where. Usually they can replace the; troublemaker before imoflier I rain passes over it. Sperry never .stays satisfied with its progress for long, and no is continually redesigning its cars. Uosides bonsl ing (.lie latest elnef ronic e< an pi mod, f oday's model is a comfortable home for tls crime Apart, from nlKce and laboriiioiy quarters, it has bunks, storage space, a galley, a dining room for recreation as well as meals, mid a steward who does Ihe cooking and maintains ilic* living quarters. One fen I ure of (.lie cars flint, doesn't change is I he durable ''I.Hiliix" enamel that gives Dunn I heir good Thi* pnl li.s- oiiri*. im h ilifo ;ti iIit Mirfrtfr, could liavi- raiiHi iI a (lorailinonl. mm . Vk'i ` looks mid prolodion from weathering. By now', Ihe bright yellow finish with black lettering on il.Kpells safer transportation to the crews of passing trains, as they throw n genial salute to the men in Ihe detector cars. Often these railroaders are just as familiar with "j)ulux" enamels and "Dtico" lacquers as they arc wilh Sperry's services. I'nr years dozens of main line railways have been using long lasting Du Pont finishes. '11 icy know I fiat if pays to protect. I he surfaces of their rolling stock along with the safely of their rails. Urnr n < { f'm Aiin t m jui-nunlr i!UH|Nim ?u h I I hal Im ha?- kiii>iv*Inn to m.ikr H, Sophie". rr;i!i'/iO" how mucli ihi^ r-npporlf- liim. I'hrer yeaiv in ll* making, a color film a boul I lie I )ti I'onf (loin] i.in y s barken mm I anil f radii ions lias been winning much favorable conmi>`iit. II s railed . , . "The Du Pout Story" A now movie aIk mif. Du Pont, described by one. re viewer as . . one of Die most unusual industrial mo tion pictures ever filmed," lias been shown to Company employes and their binlilies throughout the country and is now available for exhibition to other groups. The 72-T.nim.il;> "Technicolor" picture was tinned in Hollywood and .-it several Du Pont plant locations More than 90 sets were designed and built, and nearly 1,000 stciom tried out for the 245 parts. Top Company officials donned makeup to play their own rides in Lite movie. After a quick look at. the Company of today, flu; film flushes back to 1890, it show's how America's need for a good gunpowder and t he eneoitrageimait of i*resi dent Thomas dedbrson led lileulhere lrenee du Pent to build a small millou BrandywineCreek near Wilming ton. The picture then highlights the activities of the 149-year-old Du T'tmt organization, ernpjvuKr/ing the parallel between the Company's progress and Hit: growth of the nation. The movie, said the I'in'damf Plain Dealer, "is no mere industrial pint tire. It is historical and biographi cal. Better, it is convincing drama." The movie re viewer for the VhnUanooga Fret' Press wrote: " `The Du Foul. Story' is just as good and in many ways bettor- than a number of the productions being re leased by Holly wood today. ... If lets the events speak for themselves, which is all that is necessary." Allhough the movie was intended primarily to acquaint Du Font's 80,000-odd employes with the traditions, policies, products and philosophy of the Company, already five times as many guests as em ployes have seen it. Recently it was shown to a number of groups in Reading, Pennsylvania. Here is what: one viewer in that city had to say: "It has taught my son a vivid lesson wind* would take me a long time to Ueitn fiti 1*01(1, preoilin: lr?n I !{:'>(* |o t<!!!'), jp -town ll(<- llt-tv ;iml HiOilpcr dpi ill. "sixln jio-ivdi r'', tb;it I.mnniol tin Pont (s Iiu k I- - I, - n : :! I j I.: n . iD >! ' . Tliren tf-oit-Mi-, Pm rre* d>l<'iiiiin h im! AflVi il. ^Iiajicil ih<> *h'8iim nl` Du Punt tiller In iv - i*i" oiil llirti nl<l<*r rrhiliw* *ar|y lit |<>02. > D<- t. * , . : :, h, i-.l. ho;., I'ii-m-, falliiHHif* t ol<*ni:m ihc |>rr>?c1 rariNith it iI (i ,'nh jt, ili vri>iIV. "Wr **is a msiN'rinl nov,'" Ji#> mu. i ! ! ! : f! ..... < ' ' : K ` aLs: : 1 . I {j;.L ; :m. : . . i . J i > j i i i 1 ; til Coin|j iiny's iiiiniy products. About 97 pur coil of Du Foul'ts income eiitne from explosives in I*113, yet hv J9S9 more than MO per cent eartit* from sources oilier limn explosives. i : .. .Uthi-l! ' 1 i J, , r i , , r; I T t} } '-.-I il ;> : {f I,: -v. men l of nioiHliircjirmif cellfipIuiiK* in .1927, A col mu nisi wrote* ik `1 lie I hi Pout Story5 leaches a lesson in the funda- iiiitutills that make our American economic av^tem tick.'* of luiiiiiiinoiilal rescure11 directed toward the lutviiiieeiiieiit of scio.iiluf.ie. knowledge. lie followed. Ills brothel's Fierro ami Ircitee to ilie pmsiiltnicy, serving from 1926 to 1946, Nylon was first spun on this tiny kih machine, The movie is not a complete history of the Company, Its purpose is to eittpht`tl'*c tht*. background, traditions tin<1 principles which have guided Du Pont, since Its beginnings in 11102, explain to him with mere words--that the opportuni ties In this land of ours are unlimited ,,, By all means let others see this picture." You can borrow either a 35 or 16 mm, print for showing to your employes, or for club or school show ings, Du Font's Motion Picture Section, Room 2501, Nemours Building in Wilmington, will be glad to loan you a print. Pyroxylin lacijners became part of Du PouFs tine in 1905, but il took year* of testing and research to produce the ""Dueo7 luciiitertt thiil 80011 become siaiifiiiril finish for autos. In 191 6 ii group of llu Pont seientisfs begun five research. Prepress went slowly, a.ml the Company invested S I ^,000,00(1 Indore enough profits were earned to offset total losses. A 11 ti Foul official is introduced to plume* Otic W, Va* paper said movie ^reeorporiiiitms In the liunimi level---the of perstum lilies and tod iviiluwl prog 17] Iloniiofftmi inns, trilh 135 years ofgun design lmmr-lmn\ has tlei eloped a lightweight, cartri<ige-pnirered tool for iltiring nail-like studs Hy IJKNRY 1'. DAVIS Imagine a l:inv quantity of propellent powder, weighing about n (if 111 j ih much as an aspirin I ablet, generating enough controlled energy lo drive a steel stud into concrete or into a structural si,eel plate three-quarters of nn inch thick. This is (lie amazing' function of the Model 4HO Remington stud driver, designed and developed by Remington Arms Company of Bridgeport, Connecti cut. a Du Pont subsidiary. The c h Bridge-powered tool can be operated easily by one man. .Its portability and high efficiency are of particular in forest to I he con tracting. main tens net; and ship fitting fields. Remington's engineers claim this stud driver can reduce labor costs as much as 75 per cent because if, is 5 to 50 times faster than other methods. The i,uo! can set five or more studs a minufe in concrete, steel, wood, brick, asbestos and other structural materials. The studs are usually used for joining I hose maf erialw or attaching fixtures to them. The secret of the new tool's efficiency lies in the unit]ue system of controlling and directing f ho great energy generated by the small charge of special powder, Thu "energy supplier" is a blank cartridge. The color of file plastic cup on one end indicates the powder load, varying with the job intended. The steel alloy studs, heal treated to almost file hardness, MU resist shattering when driven. They are produced in four general types and in 20 dill'erenf sizes varying in length from % to 2 % indies. There is a standard stud with a head like a nail, and another with a hreaknff head for semi Hush mounting. Both externally and infernally threaded types are made. The operator slips the end of the stud into the plastic cup on the cartridge, opens the f ool, places the loaded cartridge in the chamber and closes the tool. It is now ready for tiring. The Remington stud driver is equipped with a number of safel.y devices which afford maximum pro tection for 'the ojxirator and those near by. A neoprenelinod steel guard is attached to file muzzle. Without this guard the tool cannot lie fired. The operator presses the guard firmly against the work surface, presses the safety button and holds it in that position with one hand, lie then fires the tool by squeezing the trigger with (.he other hand, failure to follow any one of these simple steps will prevent the driver from firing. Interesting features of the new tool are its ex ceedingly low recoil, lack of explosive noise (about like a pop-gun) and an indicator that shows the operator whether I,tie gun is or is not cooked. One advanlage is ifs extraordinary portability. Tin) tool weighs about five pounds and operates in dependently of outside power sources. This eliminates the need for expensive air compressors or eleef rie gen erators anil Hie personnel, to operate them. The op erator curries Ins source of power in his pocket, in the form of .22 caliber long rim tire cartridges. Remington lias designed a number of accessory fixtures for the tool for specialized jobs such as at taching electrical conduit to concrete and steel, and attaching corrugated steel and asbestos roofing and siding to steel frame buildings. Each accessory has a safety shield without which the tool cannot operate. The now Model 450 Remington stud driver is the first cartridge-powered industrial fool in be designed and developed hy a manufacturer of sporting arms and ammunition. oim cAfrrifiiM.ivrmviiiiifit ih ;v h :i;s In the past, sporting ammunition... particularly blank cartridges..-has been put to many uncommon uses. Cartridge-powered devices have been employed in burglar and fire alarms, fire extinguishers, insecti cide foliage sprays, auto brake testers, cable splicers, cable swedgers, riveters, oil engine sfarl.ers, mine truck web punches and oil well shooters. Blank cartridges are used in line-throwing guns aboard ship, and in guns for starting athletic events. Some blank cartridges are loaded with powder .specially developed to give a loud report and much smoke. The motion picture industry shoots up thousands of boxes of f hese, and Urev are as much a part of Westerns as horses. .Now the Remington stud driver opens up another use for sporting ammunition, and adds another rung to the ladder of progress in the field of industrial tools. Distribution on the stud driver began on a limited basis last month, and full production is planned for the near future. Millions of lilt <>f line arc mo s s w t y s iij . Wi urn wind rattles sleet ugair-sl. the window panes oa a winter night, coating the trees and power lines outside with ice, many of us make a mental nolo of the drawer we left the candles in. We want to bo ready in cast- the lights go out. Such an electrical breakdown, if it comes, m annoying to those a I home, Inil. it might lie dangerous elsewhere. In a hospital, for ex ample, the lighti-i above an operat ing table or l.lit! breathing of an iron lung cannot lit! allowed to fail. That's why emergency power is available when needed. 15very con sumer has a greater or lesser stake in keeping electricity on the job. For this reason more anti more electric utility companies in the past few years have |>een installing overhead line wire covered with "Ahithoii" polythene resin, the p Ins tic of wh icJi those familiar squeeze bolties are made. Du Pont has been supplying poly thene to Mu: win; and cable industry for this purpose since the end of Work} War II. fane wire is exposed to all kinds of weather, from sleet storms to the burning sun of summer. If (he slender black si rands are weak ened so much that they breick or short circuit, the power fails. Wire coated with "Alathmi" has a smaller diameter than wire covered with treated fabric, (he material long used as a protective jacket. Theoretically, less ice can build ii|ion the plnsl.ie-envererl line in a storm, and (here is less sur face to be liuO'elcd in a high wind. linemen like 1 lx* n iik h iIIiiic s h of wire covered with '"AIh iIn mi'' and |)n- fad ills cany Ni handle in cold weather. | 20 l win* rmrivd u 1111 loiiA.fi i "Alalltiui" [oh litem* resin American homes, |'roving il jinys lo haw*. Wire with a plastic jacket is lighter, Leo, an ad vantage for (lie men installing it. Number (i copper wire covered with fabric weighs 7B pounds per 1,000 feel, while flic same* length of wire covered wii h "Alnl.hon" weighs only 5Ci pounds. A lew months ago (he technical director of a wire* and cable inontrfaeUirmj; company in upstate New York had occasion to inspect one of his company's products - -a section of poly fItems cove red line wire that had been installed in a nearby city five years before, hie found both (lie wire; and its pro lee five jacket as good as new. KIWIS MlHSTbifk OPT This experience is not. unique. One reason for (he oulstanding results obtained with "AlathoiT as a covering for line wire, as well as in many oilier applications, is its high resistance i.o moisture pene tration. This is one of the qualit ies (hat make t ho plastic an ideal coaling for paper to be used in moistureproof packaging. On line wire, (.lie `'AlathoiT jacket not only keeps wider from the wire 1h .iI. maintains high abrasion reaisl nnee. To k Ik have shown that the plastic remains flexible a l a temperature of 41 >TA This accounts for the popularity of jx'ilythone-cnverod wire in New thiglar.fi, where cold winters require line that can he bandied at low (einperuUiros. At (he opposite end of the temperature scale, a length of polyl acne hue wire was operated for 2-1 hours with the conductor at. 2f>7 T. The jacket went off center, but otherwise remained an efficient weaflierproof cover. So far we've been la Iking about "Ala them" as a pro!eelive cover. But (he plastic is also a good insu lator, and Uiis finality has made possible a `,',b per cent, reduction in the* cosf of single service drop cable. Service drop Is the ulilily company term for (lie overhead lines running from (.he pole in front of the yard lo your house. The company has (.lie choice of running two or three separate wires !o the house or of combining (hose wares info a single service drop cable. Many homeowners: prefer the single cable- be cause of its neater apponranee and grealer sfronglh. In the past, however, this single cable cost half again as much as the separate ware installation be cause of (he elaborate rubber am! fabric insulation required. The cost- was a drawback, Today a loss expensive service drop, made o" iine wire spiraled around a support cable, is solving flic problem of expense. A slightly heavier covering of TAIal lion" on Hie line wire provides all (he insu lation needed. One Midwestern utility-1 company esl imales it made a considerable saving (fie lirsf year il switched to (bis new type of single cable. Since then annual sav ings traceable to the use of `'AlathoiT have been running to six figures, 'The sturdiness of the new cable was illustrated dramal ica.lly two winters ago when one* of the worst sleet si orms in thenre.Vs history si ruck 1 he communities served by this company. Trees and even poles were felled by (be storm, (ml. not a single cable (ailed. Klocfricily coniilined lo (low info (be homos. In a neighboring city served by another romp,any using a different type of wire, however, every home was darkened when (lie separate wires leading In Tie buildings gave way under flic weigh! of ice or were snapped by falling branches. Bight now "AlalhoiT polythene resin is on de fense a!local.ion. But for (.he pasl six years line wire covered with (.he plastic has been proving iiself rot only in tins country, but in desert regions and in the tropics..wherever superior wealher resistance Is a fact or. This experience is evidence that "AlathoiT will lie on the line once again when suflieieni, supplies art; available. !<> slurne- lurit llio mililimr.-- into ;i slutllu for I In- n hili-r 111 it>lognqilier. hul liny play limm* with power ami cniiimtinienIson lines, Sim-e idrr etHeretl wiill *" \ hitlion luis a sou,It dianicier, il resists wind damage ami In*;m linikl-up of iec. ! 21 j Development work is propm-mg salMiictortly on a new mid safer imilmd of miuitmO coal {hat imiyJ soon lead to a By H- I.. TIIAYKR A new nonexplnsive device for breaking down coal, hailed as the most important development for the pur pose in a lialf century, has been developed by I lie Du Font KxpJosives Department. It is outstandingly sale to use, yet produces eoar.se coal nt a coal anti ef ficiency cornpelilive; with other minin';' methods. Final lusts are now hemp conducted in the mints;. The device, called Cheisiechol, breaks coal by the force of compressed gas produced by chemicals placed in a reusable sled Lube. One end of I he live-foot tube in doswl by a plug with electrical conned ions; at the oilier end is a rti pit treble steel disc held in place by a perforated head. The diseharpe pressure can be varied widely. Hits makes Cliemeehot adaptable l.o tire many (lifJoiT-rrf, requirements of underground mining condi tions, washing plant facilities or coni markets. Basically, the mining operation is an exlremely simple one, The tube in placed in ;i hole drilled in the coal face, and the gas-genera I iiij[ chemical action is staffed by an electrical current. (ins pressure builds up until it is great enough to break the disc. Then 1,1 ie gas spurts through the perforated head of the tube with enough force l.o break down the coal. The tube can be reloaded at the coal face will*, another chemical unit. and disc, and Ik 1 ready lor use again within a few minutes. Setting off the reaction by {incident, is well-nigh impossible. To start with, the chemical Itself' is in active'. 11 can be converted to gas only under (.he special conditions exist mg in the (.'bemeehol tube. If the chemical unit 5s not placed in the tube properly, if the disc has been omitted, or if the tube lias significant leaks, (.lie device will not function. ('hemoehol units can't, lie detonated bv blasting caps or dynamite. Single units or whole boxes of f>0 could he run over by a heavy mine car or tossed info a fire without exploding. hk|uall.v important as a safety measure is the elec trical current, that, starts the gas-producing reaction. Ton weak a current, like stray ground eumails or the eleelrival energy from the batI.cries of miners' lamps, can't trigger tne reaction. Neither can strong ones from light or power lines, for they would merely fuse the starter wire. A current of about night amperes supplied by a small, light battery must flow for about: seven seconds to start; the reaction. Another safety fact or cranes into play at this I tine. When the current flowing through the si after wire has started the reaction, the wire disi itlegrales, automat ionMy breaking the circuit. This causes a relay to cut die current off from (he loading wires at. tlie battery and eliminates the possibility of a spark when the tube discharges and breaks down Hie coal. The gases produced by a ('liemcchol discharge won't ignite. As a matter of fact, you can say the gases - steam, carbon dioxide and nitrogen would he more; likely to smother a (lame. Al the U. S. Bureau of Mines leafing station, I lx; coni breaker has been discharged repeatedly, without causing an ignition, in highly ex plosive mixtures of coal gas and air, and in mixtures of coal dust, coal gas and air. I II 1,1) TINTS l!NI)KK WAY At, present, (Ticmeehol is In the transition si age from laboratory to extensive Held testing in Illinois and West. Virginia. 11. lias undergone many held trials in several mines, amt results have been encouraging. A maximum percentage of coarse coal was produced. Mining took place with maximum safety. Over-all efficiency was high, all hough a few problems have cropped up. These are being eliminated rapidly. When Cherneehol is used the coal face is undercut, and holes are drilled the ramie as for conventional methods of breaking coal. The charged Chernecbo! tubes are placed in the bore holes, connected, and dis charged one at a time. It's,also possible in make mult i- l. : '} ; n r i f ; i l i < ' i i > i ;>' i > I > i \ J \ i ' T ' 1 < < ' ; - ? :i misahie ('lining liol Iu Ih s \\ !h *ii ivarlmu is s<-\ nlV. Irmhl-' up* i'U pi iri n ihc il!sr ami hrt'iikiii^ tlmvti llir roui. :\s!-c< iiihh i> <*<ni|ltkln! hy miv w iiu> m\ Ih n h L TiiImv will hv pul in ii fioli* drilled in I hr rend lar<` rumu'i-ied. and tlihc liar^crl. It's Tile t llieniei'liol litb,- ciev In ImmUr toon w Urn Joailttig ImiIc .s uiiirc limn lieail high. Du Pnnl i* now work ing oof minor :m<l |i-f|**r mining Ireliniqiirt,, Min. v h i; ik f*s a fi11jtl rlir^ii |f> y.vv llml rtirmri'lioii hr I wort) iiilif ikiitl statin* haltrrv ( ihrsurrhol |>rtsV util- sl/iiidhiph safr fur lireitkiiin <t n i! h i all Ivjios nf h ij ih 's , pin connections and discharge Severn I tubes in the sequence desired. Tl 10 lubes a re easily retrieved, opened and recharged rigid, at the coal lace. Mining trials have shown that gas pressures of 10.000 to 20,000 pounds per square inch are best for breaking coal. The strength <>f the rupture dint*, best for any particular mine is determined by trials, but the: same Chemoehol unit in user) regardless of disc strength or desired rupture pressure. The whole device, including the Ott-volt battery, battery ease, controller, controller parls, leads, con ned.ions raid complete assembly, has been discussed with the Bureau of Mines, <'hetnedioi has nut, nowover. been declared permissible for use in coal mines by the Bureau because, al the immcnl, there is no official schedule of leafs for Ibis new process. As soon as the Bureau has a schedule drawn up, ('hemeehol will be anImiif ted. After the Bureau of Mines runs its permissibililv I os Is, ami after 1 )u Pont has had more time to work out minor refinements and proper mining techniques, Chemeehol will lie ready for general use. Explosives Department reprusenlalivcs will keep file coal in dustry posted. I'irlil lesN tv till llic < .hrmochoi mill In Illiintb awf IVu Virginia have |iroiiiii><>il a iiij.li ijcrci'iilugo of ci>ar<<- <-<in!. Safe hafile /tut nifty prat/nets. hit soil an fhi l*ntil perharalrs. are the la text units in ~'p ri'i-ett I tie'' fileae/iinx Modern washing machines have run the blues out of Monday (or most homemakers. Nmv (here are new easyTo-use powdered bleaches to keep I he yellow oul of the wash every day of (.he week. These blenches, based on sodium perborate com positions. arc t.l 10 lafesl in preventive measures against fabric (liscnjora; ion. A little in each wash keeps white tilings white. With colored prints. Hie background is whitened and .fast colors arc- brightened slightly to five sparkling contrast. CiimmI news for homemakers is the fuel that per borate bleaches can be used safely on all washable kihrien silk, cotton, wool, rayon and nylon. It's just n mailer of following the instructions on the package. Some of these bleaches are tailor marie lor the vicinity where they're sold. For instance, they may have spe cial wntor-HoffenerB added for areas with hard water. To the shopper, the advantage of a light, dry package over a heavy jug or hoi tie is obvious. In the home, the advantages of such grocery-shelf products an "Dcxol", 'Tliio-Whiie", **V;mo'\ "Snowy'', and "Safety" arc* multiplied. There's no danger, for ex ample, of accidentally spilling active liquid bleach on a ganne.nl and causing spots. Chemists say (be nel ive ingredient in the gen I lo new bleaches is (he perborate. In wafer it breaks down into hydrogen peroxide, the bleaching agent used bv many textile mills in giving long-lasting whiteness In sheets, towels and the like. In i aid itioii.perbnrafe house hold bleaches leave a dean, fresh smell. In keeping your laundry looking bright, il/s the regular week-by week cure (.hut counts. 'The* perborate Flea dies, used in every wash, provide `hat cure in the form of packaged sunshine. They eliminate the need for a strong bleach after fabrics have already become dingy. That's why home luunrierers can revise the adage to read. "An ounce of whiteness releul ion is worth a gallon of cure." I 25 ] The chemical clothespin ,.. I Inti's Dn Pool's line ttf " ihimusk" otlortiuls, tt'fuch tunc offer relie f from bail tutors ossoeittietl ivith mo tty industrial proiluels Hi it! day last summer two trailer trucks loaded up with drums of animal fat in an upstate New York city and set nut. for o scacoafu town 300 miles away. The first one made about as many friends en mule as n goat in the parlor. Unan,speeding motorists pulled up beliind it , got one good whiff, anti then roared past, risk!ug their necks and blowing indignant horns. The second truck rolled serenely over the road. Motorists who fell into place; behind it showed no more than the usual impatience to get by. "Not a single honk all the way," the driver reported on arriving at the port. This "seent-imental journey" wan arranged by a rendering firm which reduces meat waste to fat for soap factories. The first truck, the one; with "B.O.Y got the reception company drivers had come; to expect. The; second, its offensive odors eliminated by Hie ap plication of Du Pont "Alamask" odorant: to the truck and drums, was a revelation. Convinced by the Lest, results, the rendering firm today not only deodorizes it,s trucks and their jxif.cnt cargoes but. spray's "Alamos!*" on vats and other equipment inside; the plant--to the relic;!' of sensitive employes. Tins is but one instance' of the success of '`Alamask" in combatting industrial odors. Du Font's Fine Chemicals Division, which has been providing service in this now field for more than a year, has miiiiy more. Itecenily International Freighting Corporation. Inc., applied for help. Its ships transport decidedly un fragrant raw hides from South American ports to New York City. Two weeks or more below flecks don't improve the odor a bit and I.F.C. noughl a way to im prove working conditions during unloading. The Pine Chemicals men solved the problem by dipping the frayed end of a hawser in "Alamnsk" and siiS|X.!iidiiig it in the; hold as soon as it was opened in New York. While the space below docks was si ill no rose garden, the odorant, cleared the atmosphere to the point where if, no longer was too object finable. Then there was a fish processing plan!, in one of New Pngland's larger cities, forbidden to opera It; during the daytime because of its unpleasant waste gases. "Alamask", sprayed info the slack at a cost of $ I a day or less, nullified the odor. Now the plant lias permission to operate; around the; clock. And there's ;i large brewery whose waste was cruising an offensive odor in the plant and al tin; sower outlet;. a condition cleared up by use of the proper "Alaina.sk" odorant. Many other industries are coming to realize that plant odors have an intimate hearing on employe and community relations. Currently Du I'ont is working with rubber plants, refineries and paper mills on the problem, and is prepared to offer what help it t an to others who request it, " 'C' : -law'h;i Heifetz,, the "Mr. Violin" of the con cert stage, hasn't confined his interest in music to the platform. 1 le's the father of a new type of violin mule a small gadget, that clips on the bridge of the instrument to produce a softer tone. The musician set himself to designing a better mute a few years ago. He tried making it, of wood and metal, but settled finally on a resilient material. A friend Henry Hasten, violinist and fiddle how maker carved the first model out of an old rubber heel. Violinists in a mini her of orchestras tested it and liked if. Today ihe mute, molded of Du Tout's chemical rubber, neoprene, is being mmiufaeturod by the Fa wick Flex! Drip Company of Akron. Ohio. On each o ik * is stamped the name of Jascha I leifefviolinist, and inventor. a . ` "a- At the end of May the Du Font Company was owned by KiH.OOb stockholders, repre senting every state in fhe Union, 'flit* new total was lb per cent above the number recorded one year before. A bntil forty - four percent of the si ockholders arc* women. - ' : - We had a talk Ihe other day with Dean David L. Ann of the l Iniversii-y of Delaware's engineering school, who recently came to spend a year with the Du Toni ling-mooring Department. Dean Arm is the forerunner of several other en gineering educators invited to Jay aside t heir academic duties and fake part in a now Company program designed to acquaint, them - and consequently t heir students with lho needs of modern industry. "You might, say Tin breaking ground for the ones who will follow me,'' Dean Ann explained.4`I'm delighted to be invited." For the first nine months the dean will spend time with each of I,ho Engineering Department divi sions, asking; quest ions and learning how t he depart mend is rein ted to the rest, of the Company. He'll also visit, a new plant site, in order to see engineers al work in the field. "The department is holding not!ling back," lie .said. "They've shown me Ihe hooks, and I've even been silling in on policy meetings. If anything, they've been more frank than I'd he under the circumstances." The liiu.il three months of the year will he spent with an engineering group of the dean's own choos ing, doing the kind of work that, interests him most, lie is a mechanical engineer and a gradual e of Lafa yette College. ``You know, all of ns in education have an idea of how engineering should he taught," Dean Arm said. "If it's a worthwhile project. we try to sell it. to our faculties. This will help me in selling ideas to my faculty, mid in bet I or preparing our students for industry." ' ; : L " An experimental (lanteproof doth so new Unit if has no name was among the developments exhibited hv the Havoii Department at the recent dedication of t he Experimental Station addition near Wilmington. 'Ilie fabric, woven from "Orion" acrylic liber, is specially processed so (hat it won't burn even at, a temperature of 1400'F. The experiment id material is (laineproofed without the addition of fire-resistant chemicals. Instead, the basic chemical from winch `'Orion" is made is converted into a different chemical compound. This unusual fabric might, be used for such tilings ns theater curtains, tire blankets for plants, laboratories, ships and planes, anil protective clothing for firefighters. 1271 .Sliiiiili'Hc sti-cl irc gets a shower nftt-r lri|> tlmiHgli the deseniina' miii. Sotfinin hytlritfe /lesealittfj; speed* the prothtelkm o f this ttnigh metal so im/antant to tleft1 use Stainless steel, LI it: modern "glamour" metal that sheaths our streamlined trains and drugstore lunch counters, is currently filling a less conspicuous hid, vilal role in the nation's defense effort. 11 goes into the si,earn turbines of Navy ships, into submarines, aircraft jet, engines, chemical manufactur ing equipment, and into welding rods for the heavy armor plate on ships and tanks. But the very qualities that make this metal valu able -its resistance to high temperature and chemical corrosion... present a tough problem t.n the men who work with it. "Stainless steel, when it's finished, is scale re sistant," says the cliid' metallurgist for the ilustless Division, Armen Steel Corporation, "But. strangely enough, this means that the scale formed during pro cessing comes off that Hindi harder. It slicks tike black enamel." The Du Pont sodium hydride descaling process is solving this particular problem rtf. the Rustless plant in Baltimore, (.he only mill in (he world devoted ex clusively to stainless steel manufacture. [28 ]  Sodium hydride. Conned in :\ 700 F, hath of molten causln: soda, removes the tenacious scale and does it witIk ml attacking themed uta lemeai.h. Du I 'mil. de veloped Use process about. 1J years ago as a marked, for sodium. Sodium Isyilricle titiscaltny is faster and safer than (tie old pickling process, according to the steel men at. Rustless. Stainless steel can be denned in the hydride in anywhere from 15 seconds to 15 inimii.es; the old method required up to 24 hours. 'Hie hydride can't, harm metal: with acid, there's always the danger of its eating too deeply into the steel. This sharp reduction in descaling f line has helped speed up production at the Baltimore plant. In the pastdozen years Rust less lias increased its stool-making capacity almost. 70 percent, requiring faster handling of material all along the line. h -::o m> t a n k m:i :d i;i > The sodium hydride tank at the plant holds 58 Inns of molten caustic anrl consumes about 17 Urns of sodium and almost sis tons of ammonia each month, '{'he ammonia is cracked, yielding hydrogen for the formulion of sodium hydride. Shunless sled wire, rods and bar stock are lowered into the lank for ('leaning. Now, with increased production, a second hydride unit is; being insstalled to handle bar stock alone. Recently the Rustless Division began oval nation of a process improvement: developed by Du Pont. It involves covering the surface of the hydride tank with hiK-ly divided graphite in reduce loss of .sodium hydride cue to oxidation at the hath surface. It promises a reduction <if 2a to 50 per cent in sodium ami ammonia consumption. Urns greatly lowering operating costs. Tiirliim* likdii-.H 1 ike lfr-(* ai WrsliaglioiiM- may In * rout ed lltrimgli tin- -odium hydride lout lor d<*H`sditi*i aimmy a- eight time,- during lln* maimlarlmme cycle. Stainless steel, in row on row of wire coils and piles, of gleaming bars, moves off the Rust less production line tit. flie tate of more than 100 ions o slay. Pateli coil and each bar averages {.{tree i rips through < lie descaling lank while if. is being rolled or drawn to size. When the steel is shipped from Baltimore toother plants for fabrication, it faces nrtoi her series of de scaling operations. Bur stock from Rustless, for example, goes to the Sou H i Philadel phia Works of the Weslingl io u s c Elec tric Corporation. There the bars are forged into steam and aviation gas turbine blades. A piece of bar slock is be;tLed and forged an average of six times before emerging as a turbine blade. It must he descaled after each cycle; if it were not, the surface of the blade would be pi (tod during l ho next forging. In the sodium hydride process, there is no metal loss, according to dames M. Hart:, superintendent of the blade shop. "'If your timing was off with the old process, it, took off too much metal," he explained. "When this happened, we lost, valuable material and time." Turbine blades from the Weslinghmise plant range from less t han an inch to 40 inches in length. There are hundreds of sizes, ami each must conform to a critical standard. The blades go info tiny compressors, and into huge steam turbines like the 150.000-watt unit made recently for the Philadelphia Electric Company. From the initial singe to the finished product is a long haul in the steel business. Sodium hydride de scaling is perform mg a necessary function every step of the way - insuring that flic "stain" is laken off stainless si eel quickly and elHcietdly. OjN-ratm* at An mat- Kn-I He-- Divi-itui in Italliinorc add- lhi I*onl Sodium lit a -odium hydride *yiirral*nr. Kadi UKinlli 17 Ions of flits- metal arc consumed here. 1 29 1 wIBBi " I-,, ip: ^ 1 Hi m lly =Se j bEW 1^--PS-.: -- II Irl Them' words will bring no frighlmuni lours if you laho your t'hiltl for a dealtil okoelmg unit x-rays v.arty onough I'ivili'/.e*! eating habits being what they are, the chances are your child Is going to fi/id himself in a dentist's chair some day. The only question is, when? Once the signal for this first trip was the first, toothache... a painful way to start a life long relation ship. Today many dentists helieve that this is an un fortunate case of loo-lilUe-and-too-iale. 'The deciduous or "haby" teeth, they emphasize, should be looked! after right from the start. They're just as important to Llio child as the permanent teeth are to the grownup. In fact, they Influence the adult teeth greatly, am! to a Josser degree the rest of the body, too. As soon as all the baby teeth are in, the child should bo introduced to his dentist - with regular visits after that, of course. This is a good idea both physically and mentally. If a youngster gets early and regular dental care, he isn't likely to develop serious tooth (.rouble. Small defects can be corrected with al most no discomfort. So the session is agreeable, mid Junior feels cooperative. The dentist is his friend. At their first meeting the dentist will dean off any spots or stains and examine the child's teeth for decay. Often hell fake x-rays to be sure lie hasn't missed any tiling. 'Hie heart, of Ibis x-ray ehedarp is dental x-ray film. With it the dentist can see early inroads of decay, and correct thorn before the child feds any pain, fn addition, x-rays show whether the at hiIf teeth, are in kite rigid, position beneath the baity ones. If the teeth are coining in crooked, the pictures serve as guides for straightening them. To help the dentist with his x-ray work. Du .Pouf's Photo Products Department turns out hundreds of thousands of x-ray film packed? a year, using tire la lest in scientific manufaduring methods. Among these techniques is a new inspecting device at the Purlin, New Jersey plant. Tins monitoring instrument, a nisii It, of engineering research, checks each packet electroni cally. If it "sees" any that don't contain the right, amount of film, it automatically rejects them. Besides improving the manufacture of its regular items. Photo Products has recently announced a new product., it's a "bilewing" film in a "Puil-A Tab" packet that is easy to process .and to position in (.tie romitli. A new "Xtru-Knst" deni.a I x-ray film for use where extra film sensitivity is required will lie on the i n; t Hiel, he fV > re loti g. All in the hope that any flaws in your children's teeth wilt he caught before major damage occurs. I do J THIS STYLISH COUPEE models middling coats and hats of Enlker's ``Cape (aid'' fabric, woven of spun 1 hi Pont viscose rayon and cot I on. The linen-like mate rial is a ease-resistant and lends itself to line tailoring. Manufactured by B. J. Buchman Co.. Inc., 131 West Td.h Street, .New York. PORTABLE "PILLOW 1 I ANK, made of synthetic rubber reinforced with nylon fabric, is designed to replace steel tanks and drums for storage of gasoline near the batflefroiti. It is transported in a box and un rolls like a rug. The Goodyear Tire N. Rubber Com pany made this 10,000-gallon model for the l h S. Army Engineers. NEW ROLE FOR TITAN 1 CM. Du Pont diemists report that experimental paints containing titanium esters have withstood a temperature of 1oOCf.lL with out, burning. Such fire-resistant paints, if successfully developed, would be particularly valuable aboard ship. Experimental work is continuing. NKW SILICA. Heseardi men in 1 be Orasselli Chem icals Department have developed a new material called OH-1998 silica which lock;; promising as a thickening agent for lubricating grease. Tests have shown that the silica increases the resistance of I he grease to heal, water and median seal breakdown, Researchers em phasize. however, that (lie development is still in the experimental stage. NEW WATER RKPKL1.ENT FOR DRY CLEANERS. "Aridex" I 'Flit renewable water repellent lias been de veloped for ne by dry cleaners who have suitable dosed equipment employing chlorinated solvents. This new product inij tarts a high degree of water repellency to garments. Fur furt her iiifennation write I he Du l'ntn. Textile Service Heel ion, M-2, -JO Worth HI... New York. WOODEN SAN DAI.S. Designed forcosuahvear, these dogs have nonskid crepe soles made of durable Du Pont neoprene. They have twin lunges for walking ease, and straits of colored vinyl plastic. Made by "Ek xidogs," New Holst<`in} Wisconsin. . , . hif;'liItglils of the (/titirrvitii* mtrl> doin' by iieo/ireuo, l)n I'on Is ehenticttf rubber Thousands of (bet of air hone made with neoprene arc helping change the shape of the earth down in Arkansas whore mighty Bull Shoals Dam is being built to corral the White River, a tributary of Ute Mississippi. 'This neoprene-covered hose, manufactured by the B. F. Cloodrieh Com pi my, has a lough and vital job. At ;t quarry about seven miles downstream from the dam site, rock is blaster! out to make concrete for the massive structure. Hie hose carries .air from portable compressors to batteries of pneumatic drills stationed along the q unrrv face. In (he hands of skilled workmen, the drills bore deep info solid rock. Charges of explo sives are (.hen loaded in the holes and set off. Four million l.oiis of concrete for the new darn, enough to make a pile three miles high on a football field, will he made with the blasted rock. There was a lime when air hose used for quarry service broke flown quickly on the job. Sunlight and wenU Hiring would crack Its cover, or weaken if so that if became an easy prey to abrasion and cuffing from dragging over rough and jagged terrain. Moisture and mildew would thou rapidly deteriorate the exposed fabric reinforcement or carcass. When the carcass rotted, the lime burst and work slopped. Serious de lays oftisi resulted. Goodrich engineers knew from long experience in making all kinds of flex file hose Ihnl ordinary rubber loft much, lo he desired for products lo be used outfloors. So they turned to man made neoprene 1.0 de velop a belter cover for air hose mil only for quarrying but also for mining, railroad cross tie tamping and slreel repairing. Neoprene had excellent resistance, l.o sunlight and weathering. II. withstood abrasion and abuse even after constanl exposure, ;n:d gave lusting prof eel ion to I he carcass of flic hose. For some types of service hose manufacl urers also use lids Du Font, rubber for the resilient tube inside of air hose. Because a neoprene lube is highly resistant to both hot air and luhrical ing oil it will not crumble and clog tool parts. There's a lol of air hose in use today. If all of il were laid in a single length, j|. would girdle (lie earth at I lie equator. Some <%()(<() miles of if are made each year enough to carry air from San I Hugo t.o New York City flicn back Lo Portland, Oregon and on up to the lip of Alaska, Onarry ivork nl Bull Slionh A lonali on air Imimv bill tin* neiqimie no rrin^ a-ssircs king |||i% Introducing fi ber E A new rayon, called Fiber E, lias gone into limited production at the Du Pont plant in Old Hickory, Ten nessee. The most striking properly of this yarn is its ability to curl or crinkle into a fuzzy, wool-like fiber after special treatment. Combined with non-crinkling yarn, for example, it can give a carved effect to cutpile fabrics. Or two-tone color effects can be achieved when the new product is used with other fibers. Fiber E is chemically akin to viscose process rayon, and both are forms of regenerated cellulose. To the eye, a cone of regular viscose and a cone of "E" are indistinguishable. But there, for practical purposes, the similarity ends. The new fiber has properties that set it apart from any other textile product. As it leaves the Old Hickory plant, Fiber E has no crimp. But it's there potentially as the result of special spinning methods and special chemicals used in the bath that turns syrupy viscose into yarns of reborn cel lulose. The crimp is put in by the customer, who uses Fiber E in making fabrics for throw rugs, upholstery, draperies, cuddly toys, artificial furs and the like. In the customer's plant the yarn is soaked briefly in a dilute solution of caustic soda. When it hits the caustic, it changes from a straight, smooth yarn into a curly one. Then the yarn--or the fabric, if it's being treated after knitting or weaving--is washed free of caustic and put through regular steps such as dyeing. Another feature of Fiber E is its durability, a property that's obviously necessary in a rug yarn. Tests still in progress indicate that it has high abrasion resistance. Says Massachusetts Mohair Plush Com pany, "An ordinary test on our abrasion machine is about 2,000 cycles, but we ran the enclosed sample for 20,000 cycles with very little apparent wear. In our opinion, the resistance to wear, as shown by Fiber E, is excellent." In addition, the new product, like all rayon, is not attacked by moths. Many different effects can be had by using "E," ranging from soft suedes to rough, nubby surfaces. It all depends on filament size, pile height, density, and strength of the caustic solution used. Fabric designers are already putting "E" to work, often in combination with viscose rayon and cotton, to get color and surface contrasts that bad never before been possible. It looks like you'll be seeing a lot of Fiber E in the near future. I 33 1 ADDED STRENGTH AT NO EXTRA COST WITH "CORDURA" RAYON Du Pont Cordura* High Tenacity Rayon provides a tough reinforcement for the "rubber rail roads" used in mines and quarries. Yet it usually costs no more to use yarn of "Cordura" in a conveyor belt than yarns of natural fibers. Because "Cordura" provides full strength in a smaller gauge yarn, it's possible to make a stronger belt with fewer plies., .a better product at no extra cost. In the same way "Cordura" makes extra-strong oil hose that is light and easy to handle . . . V-belts that are stronger, more efficient and last longer. Yarns of "Cordura" are inherently stronger than yarns of natural fibers. They are made in continuous filaments with no short ends to pull apart under strain. In addition, because the number of libers and the diameter of each fiber are precisely controlled, "Cordura" yarn is uniform throughout its length. Yarns are used everywhere in industry; the extra strength and dependability of "Cordura" may offer the chance to improve your product or process , ,, without increasing cost. U. S. CAT. OFF. DU PONT "CORDURA" HIGH TENACITY RAYON BETTER THINGS FOR BETTER LIVING . . . THROUGH CHEMISTRY ouPONT CORDURA HigtilMWity Royon WRITE NOW FOR THE FREE BOOKLET "Sinews for Industry." It gives the physical properties of "Cordura". and tells you how Du Pont will help you benefit from the advantages of "Cor dura" Rayon. Address Rayon Division, M-3, Room 4421. E, I. du Pont do Nemours & Co. (Inc.) Wilmington98. Del. Name - Company ---- Address V J