Document NGEQZwR5oZY6xaBrG9ZXOG4wg

rt ... QMjjfib*. Ji trr3* VT' V 1 HOW DU PONT CELLOPHANE HELPS CONSERVE THE NATION'S FOOD .. .as told in LIFE and THE SATURDAY EVENING POST ff In the old da/s people could see nearly all the food they bought. There it was. open to the dusty air in barrels and boxes, handled by almost everyone, exposed to dirt and germs. Freshness quickly vanished -- flavor, too. Be thankful you don't have to shop in those old-fashioned, unsanitary stores. That was B. C. (Before Cellophane). ml When higher standards of cleanliness and quality arrived, most foods went into packages--but the packages hid the contents. Finally came transparent, protective Du Pont Cellophane. Not only did it guard foods against dirt and handling, and protect quality and freshness-- but it also let shoppers see through the package for wise buying. I IGHoPpOhNT ane GU'DE id lEss Wa s t e When food in Cellophane arrives in your kitchen, you are surer of getting the quality put there by the manufacturer. Thus Cellophane helps you get your money's worth in two ways: It protects what, you buy--and it lets you see just what you buy. Today, Du Pont Cellophane is doing a vital job conserving the nation's food and health. (IPO) K*C.U.S, PAT.Oft. I PREVENTION OF WASTE IS A NATIONAL NEED ). . ............ - : !: - i > j i:: 1 . 1 ! . I i :1 if ............. m :\i! < < i :1i ; : ' j 'I }. vj i 1 u l i : : 1; '. i' i Is i {; -. { *'{ I . i ; . 1 i f1 `` : i. j :i. :r : i:: ' i\ - l ; i . i: i )' ; i; i !v. 1.- '..I y ii .\ : :"i Li: - . ; :1 : ... !j 1l : Lii.1- i\ : l ::! : t. i j. ;: .......... ; , i >S. i : I *> V ` \ i r. ! . ,ti ^ ; _ j :s <; :`i > i * if. ? * {.J, .i;(. * >1 - 5 . * !> rl - i: I !i' :- : I: i in-\. *'! i : i  use of local material :iincl speed construction,-this plant ' was built with trusses anti columns of timber treated -with -ehromafed aino chloride. An unfortunate "test" proved the fire-retarding qualities of the treated wood ...when tie plant wa nearing ioiiplitioll'A'''teriSiii''ilfi'' broke out in a structure only ten yards away from the .: "plant, 'Control depended upiWt ixtiniuiahersmt'hniia' and" the municipal service. .Before fire-fighting Apparatus arrived, the plant had been exposed to a fiercely-burning . fire for thrce-anartera of m hour.,When the fire was . extinguished, the treated structural timbers were relit ...titeiy mammaled j 'thoseItrthe "few 'areas affected were' - charred no deeper than three-eighths of an inch at the ... worst'points,- Sepaira ''were insSinificant- and.construe , tiqn proceeded with little interruption. The incident re ported is an example of how far science has progressed in . improving the fire-retardant properties of wood, ' ' flte technique' of making lumber' reaintant "to ire is ; only part of the chemista'effort to overcome ether end . more important shortcomings, such as vulnerability to ......... : ; ......Ot h e r Oh b iiic il Co n t r o l s ...................... . . Hardly a species of wood resists decay. -Pew resist ' termites. Damage tone tiy the latter ia conservatively ..estimated at $4p,MQ,0Q annually. .Rokproducing.fungi.. are even more destructive, -loth losses can be greatly ^ One of the most important developments resullin meat; that enjoys: recognition as t standard in ingplahls lippei.to'UB Federal Government tor all purposes where specifi cations call for a "salt" .treatment, ............................ Lumber-treated wtth-chromated line chloride does not differ in many;essentials from ordinary wood,, for it is clean, odorliw and |mi.k c s I he inherent properties of-ordinary-wood--with-the added-quality -of-d inability- introduced through science, la processing lumber to -im-part-this-added-dunibiRtyr-the-wood-to-be-treated-is. *s ii,: t*__ q 3 ir,,j -- .I... ,, and pres sure is applied until the wood is completely penetrated. a s opposed to merely brushing, spraying or dipping, -complete.penetration-of-.-the.chemical is (> ry-to.. achieve adequate protection. This ia particularly true -where., protection., .against:, termites-, is. desired,, tor these, "insects"shmr>liKht>~and~sttack"the>~coic~of~the~,nvcodi"'fre-~ Mice is suspected. Unless the wood is treated through -iinti through, 'they are;stall able to lain . new. I daW lack to ancient times. However, thrtrue c iiu bo of decay and other forme of degradation is a relatively : recent finding. For many-yeareit was believed-that decay ....*18..caused..te.fenuentatipi.of..the mtural..saps, and wood - acids stored in the tree. But recent scientific studies have proved otherwise, and the decay-producing organisms or fungi have been klantifieci'tiB low forms" of' humidity, fungi propaeate rapidly, depending upon-the - wood cellulose for their food supply. Chemicals poisonous ' to tliiiOTj when'impregnated; in the wood, render II mi- litt'as ii source of 'f6bd"i6r"wbdd- _ ^vewot)id p i^ tvatives >r tits chemist. I thus required long, tedious study. For effectiveness on be determined . only by .the test of time* Sometimes tWs required expo* suresortwenty/ ....beeiJfrelf'TKii'wiig' ... t^rouffh'" which ,,^milax,xonditions""could""be''duplicated . within much shorter .periods. Pf Urns. :Du Pant dionuts - now maintain seven outdoor accelerated teit:-gariei in ; widely-separated sections of the country in which more - than 10,060 specimens representing scores of treatments --are - under-observation;-" These-accelersted -tests-are-aug-. merit,ed - with a .complex series of laboratory testa ill ...which the peiroaneni^ imd toxidty of fha fct^tmenti under investigation are carefully checked in-laboratory cultures of many sparfag of fungi. Other related aspects are also investigated, mch as freedom from-health haz ards, workability of the treated wood, paintability and -other-important -attri butes. - ............................................. may 6b said to fall into two the-oils iiml the toxic suits. Both serve the-purposes for which they are adapted.' Creosote oil, -bt -known - among :the oil-type -preservatives, - i - -used chiefly by the railroad companies for the treatment of croBs-tieB, piling and other structural' parts whw'lisi" 'coloration of the wood or the odor from the oil is not -objectionable." note oil for in water . . The salt-type preservatives, represented predomi nantly by ehrom&ted zinc chloride, are better suited for "lumber"that is rt>quitca"lo "be clean,' odorless arid paint- able. Wood, thin treated, ii well adapted for industrial ''''ccnBt.ruetKmi""aicl.itr'taill.roofB-"ani""itnfrstmetnrnl" members, platform. decking and other, uses in which these specific properties lire desirable. Coal mines are another excellent example, for here atmospheric con ditions are ideal for rapid decay, and safety requires the -'-protection-provided.through-the-use-of.treated-propsy ties and otter timbering. The odorless and fire-retarding -zinc-chloride we- ideal- under these conditions. Builders of new homes ire also using such "clean" treated lumber in - increasing quantities. - _. ______ ,, .. - .. producing unit in' the United States, Grasselli, now a department-of -Du-Pontj-pioneered in- research -and-ser- -vice to the wood-preserving industry. Meanwhile, pre- -aetmtivis..have..bn improved..and..better..tieating- - practices initiated' during the continued growth of this huge:and vital industry.' Chemistry continues to con ................... ' ' * " lumber industry hy open-  '^jv77Trn=Tirr ~ j-; mi-'-M.X*.' 1 .. . ,^i."' a`- vT j7 ir- ''."--'VS? ~^=- *.;:' Imb HBmh i i ' ' i:. : liilM .............................................................................................. WmUsmuWm l ! . : . ;--. .SIMMS' i d Jf i mmmam.. ................................ ...urns alBMgigg ....nss M mp ;: i j ; P I nir' . HfHr' mwmmBWWWMHjMMMMMMWi l I !i 1 S, XHM .. * uir B-- ii........................ .* .i: T - , ,. -m '. '/*' :/. . /.-! , fcU--Lj --L -4.. U-:--:.:.-.4i^-.-,.-:.. HK+-*- l4-':' 1 p:;/' VT:^:# u!:^ MBHH -- -- .^ - ...L... ....-X'm-....... ........................................ . r !:;:.i mm> ,: * i . i-.\ 1 ' ;'*' , miF : fefe&P -.-I Hi r" w vF; " ~ r... . ; ' ;: 71`if u*i!?s I { ' \ \ Vi \\ V ^3r. A'-r .:y.iV i !'!p,`i;v 1 \ h.-v S i- M . .\ j : i i -I : 's y!!. i-. il.sv-/:: 'A h\ . !'' f 'T! >.. .;;. J i J. f ! Ujl': M: i j, :* *: l:>. .[ ivs. , i.-l ' :i;' h;! ` | ! -i{ :-Ji .m :.:m' hi-.?!.- 11'. >? .! ; n'. ; , i. s - . t`t-.i ft- '!;{! j *.t] >.-h ' * it J !'; t: rVif i:r : * M ; l.Llhf:- i :I:: i . v ,->A Vr! i ! ; c:.: r!'; i: \\ lit i r | :;`U. 2j i*':; ;i: :\i ;' i-.ii'- :i m! ;*.;!>;! ::.j li;.- ; .mi i >'. :!!'{; ilic :i i`: ii i '! ii i:i:- :.! : *: * : i j * i;>., ,. i i!! I : Ki; < ! 1 I s . *!. ' |1: !1 i ;: i i; ;; s i \: ; ; )| :,i;: ; }/ >:i{M :n\ : ! s :w : i i: . !...v!: s Py i.v :] s: !:h- : ViirL-h v' .)i i*JJ. i;it vv i*.*:. hi. sch i 1J i ' tis.il i'h'iiv =:= :h\\. .1. i sOUB > l1 yi.JU-i :!. :i I-.!; J w: ' . . ! i 'tL" il :1i0B@L ` !'l: u`- i.' !:t 1 : '! ''si '>!:! \'W. 1 i i 1 . ,s : sftrfc ."ri:1 i;A.;!` ;! . . :ii: : : >.. }.' ft)|* in' j i 1 *. j i *'!' v. j, ; . \ . ; \ i! . : i! 1 . . ti :i V :h - \ h ; *:t ii I' \ : i. : : : ' I i s', i ..f . . . . k IF ^ .. ' & t ii 3Tlil 5 A .little of it goes a long way. .Only a few ounces are required w protect a ton 01 paper, : ....; ;The quantity to be added,, of course, depends upon: the severity of th* infection, composition of the pulp, .. cltaisctir''Df''ti'''eciHii>Hnt"iiruBe"'aiHl"tiieioealopwt-'; inf conditions. In some plants, to cope -with an acute alin* problem,may be necessary-for-a time- to bleed' the ohenucol into the system continuously. When con trol ia established, intermittent feeding usually suffices, and this is considered to be the more economical method. ..Use-paper - nwehme and to' ite' cii*8r Borne operator! apply the fungicide to the pulp in the beaters. If trouble .. develops.only.on .the .machine,, it,is.corracted..hy..Weeding.. the "HgnaiiMi" solution clirectlyinto the head bos which contains the pulp stock or slurry.: ' ' ' ' In mills equipped to produce both the pulp and the finished piper in a continuous production line, bacterial; ..infections..generally..am..he.kept..under...mnimlwlik:.. "LignasarT wherever slime forms. Many pulp-mill oper. atom do.. not..manufacture....paper.. Ccniyeraely, manif ..papw-manufaetiwere-ido-not-produce-pulp {-they-buy...it.:.. - for delivery In such forma an slush pulp,' rolls," or laps, which are folded sheets of partially-dried pulp some what resembling ft vary thick blotting paper. And these laps must also be protected in transit or in storage against bacteria; otherwise, slime spots will causeun-" sightly discolorations as shown in the accompanying ..illn8traioi;'AfSineeritla'''I'''recoiifieIiea''''iStticslI;' pulp mills to apply "Lignason"-in small quantities as .a: preservative. Eight ounces per ton of dry fiber usually, afford good protection to laps in. storage .for more than. ......^''''''TSe'''IpplcitirtoKi'tofAKiB''pufpoie''lBuSllF''cil-; silts of a perforated pipe suspended over the pulp sheet allypasses' over "the' wet machine "that "ftirma"tiie laps * . the wd mmhim with vntrot- valve and a perforated But-tMs much may be bo M: According to reports iyed the usee saving* .Few operators vt ho give arial discontinue its i in & number o } these purposes: 1* As a slime e beaten mi0 white-water system, in the mz. of the paper machine. 'or the preservation of lap^-rolla and'shiah-pulp' dur*' . shut-d. oii'Mliancfotl * T*o...p..n.vent doKjnff in the aknn Im, when obetrue- I*.To-prevent-deterim^ and adhesives due to bacterial or fungous infections. ..... ""In"thesedaya 'wlMiiitis'so necessary fowe paper' aiicl..to.prcKioce more..and .more of it for military and civilian needs, " ' '" " It may be he applied- in -BDlutioiif-in-pftBte-forniJ"or as-aMill men know which form is best for each operating requirementi-To 'deaerifa--tfee- wmmmmmiml 4cjBftgeB-indetail would make dull reading for readers of this publi- 1 * 1 be obtained from the Wi lli Chemicals Department. "Lignasan," designed for the lumber industry, k now serving' equally 'well'"iri'"itB'"'new,'"broader"fieidr' saving' oy fightTM iliemtii that, -lurk-i-afong--the-production -lltm... ingredient* is requited for iumh in limited Qiimititws, "Authorized ""Du' Pont ReVinishers tin.render.a.real.service"........ during the emergency . Bti OcmnoK Va mi Anethtr:iraffle~viti{3nr-nfBda-lhe~ittte?iHom~Bf~the~repeiirmim~and~Ut0~Tefimiihcri FTBE a hectic day in the office, Joe Smith went ^ down to The parking lot to get hin ear,,, found it closely wedged between two others, and with the cEor-paiel' in'tlly dented......... Matt Shaw, hurriedly trying to hack into a parking From DuPont laboratories have come not only the automobile finishes that have heretofore been applied by maBs-pMcliwtaon methods,, hup also, the refluisMiJi mate rials for touching up or completely repainting damaged cars with a minimum of delay and expense. You will be Scm-r bad a similarly'her automobile out of.the y.retiming ""wall' "was..in-" r car was bashed In; it looked rmeii"'hi8"TnaBten>iece"with' minute of every day fenders are l, ear bodies scored and scarred s of this kind. Motorists who take .. c e' of"their "care anriinnnyeci when ips occur. They involve trouble and expense, -and..if.the..repair..and..refinishing..work..is.not..done promptly, deterioration from rust anti corrosion is cer tain to follow,which is a real cause Tor alarm In 1841 and no one knows how much longer, . Every oar that rolls off the "production line at the factory has affixed to it a metal plate inscribed with a .code.number designating the particular color in which it was finished, Each year, too, Du Pont provides mate- ""riaB"Tor""lie""aatomil[Ie""renil8lieri""uae""io""thEt"lia"caii"" match all of the "production colors*' currently used by automotive manufacturers.' Consequently, "regardless of ..make or model, any DuPont reAniaher can make repairs to any damaged part and apply the mum color with which it was. originally finished. : : . Since few people hive an opportunity to watch one -of these draftsmen' at'work, if rha? "'be'interesting W" review briefly what happens when a ear rolls into the ymiretr--' a 1940 gray OMaitiobilf it .to an it to have ...industry.. fully. ..engaged.on.war.projects,.every..auto mobile now In use must be kept in serviceable condition , ..t..Ie8tlor..tlBi..ttatn..ot..tlie. war,..As long a# one could trade In. a buttered car for anew one,-it was not of such great concern. But that possibility has gone. Motorists now must guard their ears well against every agency of destruction or else--and the alternative is not pleasant ...to contemplate,. With steel ,and...other metak.earmarked, for win uses, replacements for doors, fenders, hoods and ..thelik^ la a "must.'* ` - Fortunately, that is easy to do, tor the metal uur- . Faces of pur cam, if properly painted, can be made to Inst almost indefinitely. Aa-long as there is a protective film of paint, rust and corrosion..;cannpt..;i[ft...i. foothold,........ i Pi traces of wax, polish, grease, tar or weathered film. This insures a clean surface that is essential to a good refirtiith job. Then he sands the surface and wipe* it with a rustreitinmng agent until not even the tiniest; spot of past . remains.. .He. washes .lb#. fender,.: dries it ..carefully --antfnext applies DuPont Pyroxylin Primor-Surfacer, which .wtl...aerv6...sB....ft...lnfl....beteeB...thc....ii.atsl....and..ihe...finish.. coat, and atea provide a smooth surface. Another sandtog follows, after which he works around'the patch with "Diic d " Rubbing Compound to .remove any scratches in the old finish before spraying the entire patched area .w.ith...ft..coat..f..I).u.P.Qit..,!PyrarPrep.*.,.Thi..prevents.any... I M. ....* ... . fit i i p i i MJUlfWiB AND COPYKIGHT.I942 If .."fcl.DU PONT'DC NEMOURS"*'CO." - . IrieisrfHi: ` ' mmmsmm, u. t, a , i ' i*. ih it o i ; : Hhlmm mmv reprint, wllh audit, afl artlcln. and .........mpM mmmh% .... ......................... ................................................ -- .. WrnLMmm.... ABlll.HA*,...I Ml....Nm...*$ llllSJt.lllllft ; fill..d.eMlfipmeiitB..jiKBfc... seas' of late have shocked the American....people - into a... tlmii w all-out, sustained war effort: will win the war. Further territorial enrry: on a defensive war. If Gem "HiiSyriapal" 'and..Italy.ate..to"" be" stopped before it is too late, the United Nations most attack with be brought to bear--and quickly, ....After Pearl "Harbor,"fie FSaliiii'" outlined some of the equipment re'"quired'"for "airall-out "war effort s Sixty thousand planes in 1641 i ... Twentythousandanti-aircraft pins I.. Eight million tons of ships I i .... ..but thfsy represent only a part of the material that must be financed,'fabric cited and delivered It is an ntiparalleled undertaking to supply all ..the....accpulremanta...of....tnodem....warr'" fare, America cannot, must not, fail .to .iDii#tlta..fifitiacEeai.i.ng..ii!ipon8ri. bility ini "the arsenal of democracy.'1; : To do this job, to win this war, will draw heavily upon all our national resources of men, money and ma-i .tofiiili,. perbapslto.. the. very, limit, M must not be said of Americans that; That liiis Seen tie epitaph of too. many-nations now under bondage.; Cost what it may In blood and; treasure. World-War 11-must con-; tinue until our enemies..sir..overt. whelmingiy defeated. War is .never cheap, but it is a thousand times cheaper to win than to lose, which is reason" enough for urging all citizens to-huy "United sterBefeiiae "Say-" iiiga Bonds regularly out of current earning#...Our..nation needa... and will need--every dollar that can be spared. To quote one official:' ' "We realize that should this nation Ml short one ship, one plane, on tank,. one., gun,... on., bullet of- the number needed to make us victorli...tMLbufliiwilI.!mK...aurs.in... the hands of those who now direct it,our freedom as tad wklmMwill be ended... our hopes for the future will turn do tabes." ....Mtefrom States Government Bonds and Stamps are the safest securities one advised; whether- one be prompted liy self interest or by patriotism, That.ia why arrangements for pur- "through.. pay-roll.. deductions' been made in our nation's industrial ' plSSfs.iicluaifig"ifioaeir tie'Di Font' organization, and-why all Americans to tie limit, of their ability to help finance the war program. The need "for"iCiBpBfatin""wl8' "filter.greater than- now. It's bonds or bondage, -There--can-be no-compromise, There' mist b no deity,...................... .iBpirlant.lt. lipJitlfisJiift. I Amij ik a i. regulations for the conII tool of.explosiver-and-their in gredients In time of war or national emergency became effective March 18, 1942, following the enactment and approval of the Federal liplo-Hivca.Act.on-Decamber-26;.. i#4t.These regulations, which have the .force:and..sffectof.law, require,.with, few -exceptions, all persons who manufacture, purchase, sell or use nated to obtain federal licenses. It is .important.for....those....whc(....hava not. ...for.. yMifion...M.. tliJawa... and.r.egu-... luiuin.iiirt- imtiiuhnW.. by heavy fines and penalties, Copies of the regulationa may. bo obtained from the Government Printing Office, Wash ington,..!),. C,....................................... - Just Iff Prill.., - OR twenty-four years theBlaster* FHandbook hy Da Pont hau been ....recognized..aB...the.ono..authori.tative.. manual of information about explo. gives and Jw to use them.. No other. book of the kind is published in the ' United States, and 'it'is also'unique' in another way. This handbook, pre pared for explosives users, serves as ; a textbook, in. some, of our nation's leading engineering and mining school# MKijmltoges,............................... ..... The eleventh edition, like all the others preceding It, was prepared by' the technical staff of the DuPont Explosive* Department. The infer- - . paneled to 34(1 pages, contains upto-the-minute facts about all types ;...qLiiBliwi>'lBiattnr..'afentB,.;iip. plies and accessories. A limited man- Mr of copies, bound la "Fabrikoid" eoated fabric, is available for sals at. one dollar each, Orders should be addressed"" Cb.tiie""Aaveftisiiig' Be-" partment of the DuPont Company, ""Wilm in gtonyBel swam.......................... .. ' .............................................................. The Cover Picture TT'l s e w h b b e in' tills number is ' ""li.presented a review of rwearcb... activities in the dynamite industry during-the ...past- forty' years. '"With... that background, it seemed appro- ; prfate to portray on the cover page a subject keyed to some phase of the work at the Eastern Laboratory. So ' wo taka you-inaide one of the build-... iuga where dynamite ingredients are ..-brtmght....together....under....the....CLhaM[r... wheels of a small mixing unit which is used for experimental production. ' * ' "The value of freedom is that it never diss; We have seen great milL.;" tary madi ines built up on despotism. We. have -seen--them achieve-tem- pommy success, and they may have .' further temporary success. But we know that they are headed for dis aster. This war is a war of peoples who. insist, on-their-freedom--not only freedom as nations, but also .freedom...aa.men^freedom..in...spirit,.... freedom in economic life. The time to make those freedoms real is now, not later-." - A. A.'Bb m,!, Jit, ........ Assmtiml Sei-mimuMMub!... might can extendedby adding #-3 btforrito tills chemical also improves the ap^ -pcaranec-oC-products - containing reTM : IinInI puUfluNcortDKvVct wcfeMcuIlTIIiLii even the poorer grades of leather, shoe manufacturers are turning to1 Tabrikoid11 pyroxylin-coated fabric for bindings, heel covers, ankle straps, quarters and stripping. They are us ing "Texon" latex-impregnated fiber linings of footwear, - - An '`e l e c t r ic urnm** invented in- n Du Pont laboratory provides a rapid., and: reliable means of determining the concentrations of certain solvents and chemicals In the air of work rooms* This device detects the pres ence of as little as two drops in a room of average ike. Thanks to. its use, excessive losses, usually due to "faulty oji^^ meat, can now be reduced, "SftFimr Mic r o c o py " film for docu- lmllcwliitbnirll*yv rltiJirUviOmLrLfU11.L,ljiimlUtii iOmUntpiUnSaCoSa, ea-iljintr-*Gp the war, Is being fust adopted by many industries,-This 35 mm, film* until recently was lined chiefly by libraries and newspapers. Now it is "being..u mI-W' reproducing.docu ments and drawings m manufactur ing plants and business houses with limited facilities for safe storage.. . A^s t r e a mu n e d " process of bleach . in& ...textiles .with hydrogen .peroxide... mata cloth snow white in two hours, as 'compared with fifteenth twentyfour hours under former methods. ' -Po l y v in y l alcohol-resins "are' now being extruded in the form of a tubTM ini..wldeh-.l^.rosistont..to..altcommoii. oils, fats, greases and solvents. This tubing is replacing rubber hose in refrigerator applications and many other frgtaUatkms' whew "oil resist tance.. is-important.......................=....... A r e c e n t development often con . aiiiwiw.ef'wlni'witoei*fHiavvilliou"grpunHVSiAllwi!!uHietiiseisi t*\p distinguishing between compounds that have many chemical features in common. Similar to microscops used in studying the structure of rocks, a petrographic microscope is tosaAIcm^ organic compounds--even :gaBes or liquids--provided they can be con verted. to crystalline deriv&tive&*The actual identification is achieved by transinitti ng polarized light through the crystal - prepared and placed on the market " Th e "periiisibli"'imbiit" of.tin'Tor'' plating metals and containers lias . 'been' reduced 'drastically. Tinplating . generally has been, done by..hot dip ping, Thinner but satisfactory cemt. mgs erf tin can now be obtained by electroplating with a saving, in some Instances, "of"up to 'sevency-five per cent of this vital material ............. :...:.............. ...... :............ ;............. Ammo n ia, cracked by beat and eate alysts to its constituent gases--ni trogen and hydrogen--is now used as fimmee atmosphere in many heat treatingpperations;' Itnotonly gives a superior product, but also saves time- uni metal, .formerly. lost in pickling and cleaning operations. Th# metal leaves the furnace in a bright condition and needs no further ' processing* When heat-treated In the .usual manner, oxidation iorms a. scale that must lie removed, ................................ ................................. To EELiEVE the shortage of plastics and laequered-metals, macy'mami; facturers arc making certain ' of "wood" and' 'covering" them wl .."J?abrikd1d"py^ tanning'industry It . that skins silkier grain than those prepared '* ` arid, tie reagent cornused in pre-war days* - *........................... nuf&cturere now provide tlIdbreroployeea w^th"ts P^o-TekMpro-i tective cream* Workers apply it to their hands before, starting .to. handle dlrtyorgramy mafifliilc'ft'aotsll#' visible gloveahd prevents grime ork, only a wash-up, with water,, is. needed .to .dissolve the film and any dirt accumulated ..aw!t.,.A...^ to mmmmmd. 'Tro-Tek." itu.re.of radio tubas. certain heat-treating operations must ' Ira'lnlf v^ rtive reaction between air and delicate' tube' pamt ""Cracked ammonia, we are informed, is now being used as a furnace atm by many manufacture. ****** cellophane is now star to play a new part io pack&gi "one'"'that.raaV''' tieVelbo"into..iin'nortanee from th# standpoint of conserv ing materials essential to the war effort* The container industry,. in cooperation with Bu Pont techniV'hii'i,''fduni!'''Wftp''''to.uiirraolr paperboard -to replace.. the metal bodies of ciins and also to form entire containers that provide adequate protection for certain types of food, drug and chemical products. Some of "thw riwpackagesare already in successful commercial me. Another ..direation.rtii.which,-.Du-Bonl.. ceLLo-. phane is helping to conserve metals Is in the replacement of foil ns a material ou products re- . JflMc hunting "Wh*U ffMmm'MmI* the I% vmnta broken -more 4ied tii HiI*wKwi' .i#" Awi####<" best ? E-detail-of'-a -number' of experiments* on -powder from clif.lerenrt made by him, at my request. I 'was well- aware that, many ' partialities existed in favour of foreign powder* attcTprejudfce wis'mgamit'oiir own; .Jt.waathetafere eomidered..adlsabie... to have a fair and impartial trial . given to .both bymmBjmmnwMrm. ""Pr&fds^oh'-and-charactQr'-would'-d-" 1enee every suspicion of mtmmm or partiality; and the public may rest-assured that the following is a of 1837, `To the author of .. .. - .. The Amer-ican Shooter's Manual is and..........I...t.....I.......w.....i.t...h......m......u....c..>h......p....n.*d"iie..............% faction I communicate to you the tmnBMmmmMi you furnished me for that purpose, Messrs. Dupont de Nemours &-Ca. ofEraiicl; I am "rminif ' en~ able me to do justice the raamifactnrers who. from th care and enterprise,"bave"iiot'Oiily"bwn )le to compete with,' but have at* In tt-iew-years csutdoiiemll-Europe in tMi important article. This is i pretty-bold assertion; 'but it w never-' " theteaa true, . .....-There..k certainly no -nation.in. the world whose manufacturers* in general, have ao Justly become eek-: touted as Great Britain, and in no article," perhaps! more than in gua- ...pow.citwJI'fca.S'wBehpowcler.haa.baeri. highlyspoken of, but by experiments .made .upon. ...what, .in ..called. i Jiff's.. ~pou>derrmade expresaly-forthe' King. of'France and Ms'court, aid which' is doubtless the best made in France, : it has been found not to bear own-: parison with Pegou, Andrews & Wilke's, which is no doubt the best, foreign powder ever introduced Into this country, . `The annexed table will shew the result of the experiments, which were made upon an improved eprovette, epruviie'S'iiothmg'Sofe'thafi'''' chamber capable of contain ing about"the chaw fora"] breech fowling piece, placed in ' tieal portion, so that the action of a weight of about four pounds, art ta&lMttfa lever, i's'let iciwa'so astd cover the chamber. To the moveable -end'oTthe leveri'a'-graduated'ribbon'" is so attached that when explosion takes place, the weight is thrown up, taking with it the ribbon, which passes through a small slide; the XYeighte'of coureef place, but the ribbon is told by the alkie* atih&'poinl'tawhmhthm forceerf tbe powder .carried the weight. `By this it will be seen that Du- than the best sample of foreign, 'Havii^ tested tboatrength, 1 shall bo w prcid to shew the quickness of the different samples, as proved by'a machine' invented toy Mr,-A; PiipenrtThf manner of tingqilclc:. .i k , * .* . t and satki actory It is nothing more than burning "a train of twelve feet,' or 144-inches, of-each-of the-twosamples to toe tried; these trains are laid parallel to each other; and the board beinggreduated, you see plainly the comparative' quickness' of "'each' sample. The following is the result of''these''isi'ptrtiiiiilti;"Dupont' taken' in the standard* one hundred and forty-four. {(Jtmiinmd Psm TumitM-Four tampi .. Ini. ItiAiimi j imi li&im n* :Ii LHitpk.'t'ta SSE Rf.M-i.yt RiJlilfp ill IJ#gra Pligou, Andrews & Wilke's iingfe seal . 82 ( 81 du'.""do'."double" ...... 9S..... ......81..... do. di 110 105 ' 93 98 re 82 ' 112 j .115 l ill S' lir siM nM.m.lto..ki...ihs. Jh 82 ...... 91...... l-iiiiigBikiiM'' 1.07 stronger dmn !? Pegou, Andrews' & Wilktfa Can- Hit.. TLiL i; liU ; di" Uli iiii.U' Vi' .'I ' K A Is i I- H i'L-'ih Vv I V it r i V i U K L!: .t r! -1 W i H f:. ucw n r; .v f.= i ft:!:-: `.s'. -:r i l;:V 0 i. , .. . {. i.1 i......................... ] ... { - ,v. . .l . .f i. ..............i" - j j .. i - - - i : - *-i-**-s * *--* ;: 4 a\ ^rnm f' Cjf'yGiiK Ui'IuHl OV mafrrmk ONE OF A SERIES of advertisements designed to keep yon posted on Du Pout products and services THESE DU PONT PRODUCTS ERE are three du Pont H products that can help you meet today's huge demand for ore -- through increased efficiency, effectiveness and safe ty in underground operations. What's more, in many mines these products will contribute important savings. GELEX semi gelatin dynamite FOR LOWER BLASTING COSTS/ along with the other important properties needed for underground shooting, du Pont offers "Gelex,"* an outstanding semi-gelatin dyna mite. "Gelex" cuts blasting costs at many mines because its good water resistance often permits it to be substituted for the more expensive gelatin grades. "Gelex" is plastic and cohesive -- hence well adapted to loading, even in uppers. "Gelex" detonates with high velocity assuring excellent fragmentation, and it pro duces a minimum of noxious fumes, thus saving time at the face. With all of these advantages, it's not hard to understand why "Gelex" means greater speed, higher efficiency and lower costs in blasting. V E N T U B E ventilating duct BY KEEPING THE ATMOSPHERE CLEAN with "Ventube"*, you speed up work, and make it easier and safer. All you need is a suitable fan and tubing to reach workings. This flexible tubing is easy to hang -- one man can install an entire system in a few hours. It takes little room, and goes around corners without appreciable loss of air. "Ventube" is made of special im pregnated cloth that resists acid water, damp and dry rot. Write for complete information. <3P1P *< u.s.p.u.orr- C Z C treated ties TIES AND TIMBER LAST MANY TIMES LONGER when treated with Chromated Zinc Chloride. This longer life in mines is due to CZC's decay resistance. This treated timber is also fire retardant, clean, odorless and safe to handle. You'll find CZC treatment a wise investment for cribbing, shaft tim bers, air course timbers, haulage way ties -- all timber above and under ground. Write for loca tions ofthe nearest treating plants. *Trade Mark E. I. DU PONT DE NEMOURS & COMPANY (INC.) WILMINGTON, DELAWARE HELPS YOU MAKE ENDS MEET ... by helping make your old things do ! O MEND OR REPAIR is not only patriotic, but Tnecessary nowadays! That's why so many folks ing old books ... and for a hundred other purposes. Even people who haven't tried it know that it's use I) rco Cement. They know it's waterproof, good because it's made by Du Pont. This has been transparent, flexible , . . that it holds with a "bull their guide to extra quality in auto polish and wax, dog grip" on 'most anything (except rubber). Not anti-freeze, paints, cellulose sponges and other affected by heat, cold or moisture. chemical products. And they know too, how handy it can be around the house . . . for mending broken dishes, for re pairing furniture, for building models, for rebind d ry Duco Cement for your mending and mak ing jobs. On sale at leading drug, stationery, hard ware and variety stores everywhere. IN 1 Otf and 2 5 TUBES Fr Cj Paper, j UCO CEMENT la.U.S. REG. U. S. PM. OFF.