Document DMVYgzy4Xq61y05qB7mxVBO3Q

! WHAT'S HAPPENING IN THE WORLD OF LEAD The Second International Conference On Lead, October 4-7, in Arnhem, Holland, will report up-to-the-minute developments in cable sheathing, batteries, and other uses. The Second International Confer The batteries group is to hold one ence on Lead will be held at the Hotel session on battery uses in vehicles-- Haarhuis, Arnhem, Holland from automotive and truck batteries, rail October 4 to 7 this year. Organized road uses, and industrial vehicles-- by the Lead Development Association and another session on technology in London, it will bring together top and manufacturing. The latter will in authorities in several fields of lead clude papers on large scale produc use from countries throughout the tion, quality control, and various free world. In addition to technical special lead acid batteries. The final papers (simultaneously translated a day of the conference has been set la United Nations) the conference aside for tours of local German and has scheduled several discussion ses- Dutch battery plants by this group. and trips to nearby industrial sites where lead is consumed. Beginning on the second day of the General lead uses, covered by the remaining concurrent sessions, will be conference, separate technical ses highlighted by papers on corrosion sions dealing with batteries, cable control with lead, sound and vibra sheathing, and general uses will be tion control applications, the new run concurrently. continuous casting technique for lead sheet, and summaries of current re The cables group will hold techni search and development work, espe cal sessions on the 5th and 7th to cially that dealing with organolead look at recent developments in disper- compounds now being evaluated for sioned strengthened lead sheathing, a wide variety of uses from marine N continuous extrusion, international anti-fouling agents to chemical cat standardization, and recent research alysts and stabilizers for plastics. !l developments. On the intervening day, visits to five cable manufactur The conference is sponsored by the European Lead Development Com 1st ing plants have been arranged. De mittee. Copies of papers can be had tailed papers on fatigue testing, by contacting the Lead Development Ci thermal movement, transport fatigue, Association, 34 Berkeley Square, and several continuous extrusion London Wl, England, which is acting PI methods will complete the program. as Secretariat. "Those scientists can do aboj thing" was the reported comr an "oldtimer" in rural Ontario watched buckets of onions out of a truck trailer as potatod loaded into it. Of course, there was more than met his eye. The trailer the mobile vegetable irradiatotj and operated by the Comn Products Div., Atomic Enerl Canada, Ltd., Ottawa. Yecel such as those potatoes and oniotl conveyed by the bucketload in) lead shielded irradiator where! are exposed on all sides to gamd diation from a cobalt-60 source! treatment, at an 8000-rad level,! tively stops sprouting and great! duces spoilage during storage at Assembling the main radiation shield . trailer. The shield contains about 3.! of lead. JF OTATOES r i 4 |.|r*Hd and treated onions show effect of iation on sprouting in storage. Left to : Zero, 4000, and 8000 R. Lntures up lo 70 F. What the old er saw was merely a switchover irradiating onions to irradiating ej^'tatoes. j_ The AECL irradiator mounted in a l, indard 8- by 12- by 34-ft. trailer is been operating in Canada and the nited States for the last 4 years proi u-ing potatoes and other vegetables the rate of 2500 lb. per hr. The ir^ liator is one of the first to be in op tion. Authorities generally agree at the mass irradiation of meats articularly freshly caught fish) and getables is rapidly approaching the koduction stage. [The mobile irradiator consists of ; main sections: the conveyor system that moves vegetables past the source; the radioactive source itself; the lead shielding that makes unit completely safe. How it works In operation, potatoes are conveyed ito the trailer in buckets that are -by 8-by 15-in. The power conveyor rlts do not go directly to the irradiaur but make a number of right angle turns to block any potential radiation leak path. When a bucket gets into the lead shielded irradiation chamber, it is in serted into a vertical conveyor and carried upright completely around the radiation source in a Ferris wheel like motion. This motion is intermit tent so that each bucket remains for a predetermined period in each of eight positions around the source; the eight positions are made up of two four position rotations. The 30,000-curie source is a co balt-60 rod 15 in. long, sealed in a twin wall stainless steel capsule. Dur ing travel or maintenance work on the irradiator the source is retracted into a lead container that has walls 12-in. thick. About 6,700 lb. of lead is used in the safe storage container. The shield around the irradiation chamber and the conveyor is also lead. Those walls are 10-in. thick. In all, approximately 6,500 lb. of lead shielding was used in the main shield assembly that is 30-in. long and 40-in. in diameter. 3-- - Ll /L26414 Tfijr Have you ever wondered? WHAT DOES TETRAETHYL LEAD DO? Tetraethyl lead was nnte the hall mark of a premium gasoline. Today. 98 out of every 100 gallons--regular as well as premium --contain TEL or one of manv mixtures of TEL and its chemical cousin TML I tetramethyl lead ). For your engine Modern gasolines contain at least three and sometimes as many as six or seven additives. These combat spark plug fouling and preignition, carburetor icing and deposits, protect against corrosion, and help overcome operating and maintenance problems. TEL and TML have a specific job: thev increase octane rating, or the gasoline s ability to produce power without knocking. By protecting the engine against harmful knock. TEL allows it to get more useful work out of every gallon. TL ithout the TEL in modern gasoline, the octane rating would be that com mon many years ago, and perform ance and efficiency of your engine would suffer. For you If you were forced to use gasoline with an octane rating that prevailed about ten years ago, for example, it would take eleven gallons of it to do what you can do today with ten gal lons. This sort of difference in per formance corresponds to the effect of the TEL in today's gasoline. Put an ------ ANTIKNOCK COMPOUNDS AND PUBLIC HEALTH------- For the more than 40 years that antiknock compounds have been in use, they have been subjected to continuing thorough research from a public health standpoint. Most of this research has been sponsored by the antiknock compound industry. The research has shown that: 1. Antiknock compounds do not contribute to smog formation. 2. Lead compounds discharged into the atmosphere in automo bile exhaust have not created a hazard to the health of the public. 3. Concentrations of lead from all sources (including antiknock compounds) in the air of American cities is low. 4. The amounts of lead to which the general public is exposed-- from all sources, including foods and beverages--are far below hazardous limits. 5. During the last 20 or more years, there has been little change, in the intake, output or retained amount of lead in the body of the average adult American. Just this spring, the U. S. Public Health Service published the results of a comprehensive survey of lead in the atmosphere in three major cities--Los Angeles, Philadelphia, and Cincinnati. These results confirmed earlier findings that atmospheric lead levels are low and present no public health hazards. other wav. TEL saves the America motorists about S2 billion a year i gasoline costs. For the oil refiner The oil refiner adds a small amount of antiknock fluid--onlv about one teaspoon per gallon of gasoline. This addition, in combination with the processing given the gasoline stock, sets the octane rating of the finished fuel. If processing alone were user) to achieve the same quality, the sever ity of the processing required would substantially decrease the gasoline yield per barrel of petroleum. With these antiknock compounds readik available, refiners can produce both premium and regular grades of gaso line simply and economically. And they can maintain the octane ratine of these grades dav in and dav out. Moreover, by attaining the desired octane rating in this wav, refiners need not make the large capital out lays otherwise required for additional octane improvement facilities. For people everywhere Currently, the use of antiknock compounds is saving almost 200 mil lion barrels of oil a vear in the Lnited States alone and million? more in other countries throughout the world. Over the past 25 years, these additives have saved an estima ted 5 billion barrels of petroleum worth S15 billion at current prices. But beyond conserving these irre placeable natural resources, anti knock compounds help achieve effi ciency and economy for all motor vehicles. This includes not just the cars we drive but the buses and trucks that serve us. Increasing world need for TEL and TML, once produced only in the L nited States, has led to other facili ties to produce these materials in England. France. Canada. Mexico. Greece, and plans for plants in Ger many and Japan. --T LEAD PADS FOR SLOAN SQUARE At Sloan Square in London a new office and apartment building is being completed over one of the local elecIric railway lines. Though ba.ieaUy a surface electric railway, the line makes frequent dips under major highways and buildings. The new sta tion building is. therefore, not partic ularly unusual for being located over the trackage. But it does represent a new devel opment in vibration isolation in the United Kingdom because it will rest on 29 lead-asbestos anti-vibration pads to isolate it from any train-in duced vibration in the ground. The pads themselves are relatively small--the largest 29" x 28"--since they rest atop the columns over the track sections. The highest static loading on the pads will be 760 psi. Two of the techniques used at Sloan Square are noteworthy: The pads were held in place during con struction by cementing them to the caps of the columns with an adhesive. Once the pads are under load, of course, the adhesive will have no ef fect. but it does maintain alignment during the work without introducing any by-pass path for vibration at a later stage. The other point worth noting is the resilient material used to surround the pad installation be fore any concrete is poured. This also prevents the creation of a by-pass. Quiet Exhibition in Paris The Radio and TV Exhibition held two years ago in Paris was, like most exhibits and trade shows, well attended by interested spectators. And like most exhibits and trade shows, it was partitioned with light, temporary wood-and*hardboard walls. This could have resulted in a severe problem-- the difficulty in hearing superbly recorded and reproduced music over the background of the crowd's conversation. The quick, convenient, and technically adequate remedy for the situation was sheet lead 1 millimeter thick (approximately 2Vj lb.) used to bolster the sound-stopping power of the partitions. LIA26416 FOUR ROOi IN HALF rJ' HERE'S a lot more to running a first-class hotel than providing bed and board. Meetings and group func tions require private meeting rooms where a quiet committee of twelve or a boisterous convention of a thousand may conduct the business at hand. The famous Sheraton-Chicago, host to about 1500 such group affairs each year, serves organizations whose pro grams may call for a general meeting of more than a thousand people fol lowed by 24 simultaneous committee programs--each in its own room. If a hotel contained all the banquet halls, ballrooms, parlors, and meeting rooms needed to meet this sort of re quirement, and if each of these facil ities were maintained as a single purpose room, there wouldn't be much space left for guest rooms. The Sheraton-Chicago has found a system of removable walls which convert its large halls into the smaller units with excellent privacy and with such taste ful, unobtrusive decor that it is hard to tell which wall is permanent and which can be removed or replaced in a matter of minutes. For example, the East Room at the Sheraton, about 75 x 75 feet, can be split up into two, three, or four rooms by these walls. If the maximum four rooms are required, the record time is just 18 minutes. When finished, only close scrutiny reveals which walls were installed and which are permanent. And the acoustical pri vacy has been adequate for every function to date. The remarkable wall system that makes this possible is a hollow wood en panel system which uses onepound sheet lead as an internal sound barrier in conjunction with internal sound absorptive material and a sys tem of seals and locks. Developed by Kilgore Removable Walls, Ltd. of To ronto, it is manufactured and sold by the Pennsylvania Pacific Corporation of Warminster, Pa., under the name Soundivider (trade mark). If there is a secret ingredient i wall it is simplicity. Xo geartj or conveyor chains are require! cause the two-foot wide panels only about four pounds per sq foot. Two men easily and qu| carry and emplace the typical ten high (80 lb.) panels. There arj pneumatic or hydraulic seals tol erate (and repair) because each I is built to fit its particular spot j three sides of the panel fit tonl and-groove against soft rubber! foam gaskets. The foot of each pj is sealed by a gasket and a facing carpeting which also protects fid from scuffing. To bring the sealsj tight and make joints all but inv ble, each panel is locked to the by a concealed cam-locking faste as the wall is being put up. Only battering ram could move it, i locked. Recent tests (see plot) at Riverbank Acoustical Laborato;11^ show that the Soundivider has a nin ten Riverbank test data for Penn Pac's Soun divider. The Soundivider wih slice 25 feet off the 85 foot long Tally-Ho Room (shown above) without spoiling the handsome decor of either portion. The removable wall is indicated in green in the floorplan. Close-up of the wail ete! edges. Normally, twfl ndlt visor is locking two of sis t LIA26A17 for ONE HOUR t j, ^uency average of 30 db and a m* und transmission class of 35. re, proverbial one-armed paper' v inger is n0 busier than the convensq )() services department of the Sheraquj n.Chicago when a big meeting is in tea. egress. When the new removable ar. ,1) system was being installed, there to is understandable apprehension h iout the convenience and w orkabilot F of the new system. But when two oiij the hotel's carpenters finished in let ,Uing all the channels -- it took i p, ,,m about three working days, inj iread over the two-week installation flu -riod, all without tying up the ak unis when needed--and the walls Hi their first trial, worried looks en<ianged to smiles. The 155 feet of st? ail in the East Room can be erected J t taken bwn and stored by two ausemen in less than half an hour. > jihe 116 feet in the Exhibition Hall -atojnd 4f> feet in the Tally-Ho Room go nimen faster. vdll failafion shows the tongue-and-groov* twfl die the whole job. Here, their superi of >iIs already installed. WASTE SPACE + LEAD = QUIET DRAFTING ROOM Sheet metal work in making wash ing machines is no quieter down un der in Australia than it is anywhere else in the world. But John W. Stamp Proprietary, Ltd., of Carlton, Aus tralia has salvaged some wasted plant space amid such an operation and built a quiet, modern drafting room. It all started when the company decided to locate the drafting room over workshop operations which re quired only eight feet of the available 24 foot headroom. A mezzanine floor of 42 x 17 feet was built of steel joists, wood, building felt and lino leum. Walls were erected right up to the sawtooth roof, varying from 9 to 15 feet. These were framed with 4" wood studs and covered on the out side with 5/iq " Masonite. The interior finish was xh" fiberboard. It must be said that the results were not very satisfactory from a noise point of view. The light walls and the many sound leakage paths resulted in frayed nerves, misunder stood telephone conversations, and errors. Called on to examine the problem, the Royal Melbourne Institute of Technology suggested the use of sheet lead as a sound barrier. The design for the barrier, as it was finally erected, was Vie" plywood, and Vi" polyurethane foam, and 2-pound lead, all bonded together with adhesive. This lead panelling was screwed to the Masonite exterior in 6'x3' sec tions with wood battens over each joint. To further seal these joints, the lead was allowed to overlap by 1" all around. At the same time, atten tion was given to sealing up all the openings for piping, w iring, air con ditioning ducts and other obvious leaks. Not only are the draftsmen pleased with their new quarters, but the man agement of the company liked it so well that they have allowed it to be examined by anyone facing similar problems as an example of what can be done. It is true that occasional noise from a pneumatic hammer or press can be heard in the drafting room, but these are not generally troublesome. One of the incidental expenses of the conversion says more about its effectiveness: An additional loudspeaker had to be added to the plant paging system because the draftsmen could no longer hear the speaker outside the drafting room and needed one of their own. --7-- LIAZ6418 I K i I Boeing Builds a Boost Mason-Rust's immaculate, white ambulance, equipped for emergency aid (above) and a battery fork lift truck on its way for a load of vital parts. Amid all the exotic complexity of space technology the mundane leadacid battery, perhaps somewhat un expectedly. has found a strategic po sition. A case in point is at the .National Aeronautics and Space Ad ministration's Michoud Assembly Fa cility in New Orleans. Here the rocket booster to be used to start the manned Apollo spacecraft on its long journey to the moon is under construction by the Boeing Company. The huge rocket, being developed as the first stage of the Saturn V un der a contract with NASA, is called the S-1C. It is the largest rocket stage under development in the F nited States. The S-IC is 138 feet in length and 33 feet in diameter. Five Rocketdyne F-l engines will generate 7.500.000 pounds of thrust to lift the 364 foot. 6.034.000 pound Saturn V/Apollo off the launch pad at Cape Kennedy. Burning liquid oxygen and kero sene. the S-IC will propel the threestage vehicle and manned spacecraft on the journey to the moon during the first two and a half minutes of flight. Then, as the first stage drops away, North American's S-1I second stage takes over for about 644 min utes. At second stage separation, the Douglas S-IV-B third stage and at tached spacecraft will go into an in clined earth orbit and circle in a parked orbit while all syste checked out. Then, with all ``go," the third stage is jettisor ter placing the Apollo spacecra: lunar trajectory at an escape v< of approximately 25.000 mph. About three days after Earth, two of the astronauts w scend from the spacecraft ti moon's surface in the Lunar sion Module, while the other naut continues to orbit the mo the Command .Module. Depet upon conditions, the two men moon could remain there up week, before rendezvousing wit! third man in the Apollo Com Module and starting hack to some 250.000 miles awav. That is the plan for the A moon mission scheduled for this ade. and the important role tha Launch Systems Branch of Boei playing at NASA s Michoud A bly Facility in New Orleans. But where, in this dramatic set would one expect to find the pr lead-acid battery at work? Cert the word "battery" is not ne space, but let's take a closer look at Michoud. For one vital function, the al surgically clean environment manded in space development construction requires battery ered sweepers to constantly patrol LIA26A19 Band Batteries are fcrres of especially treated glistening sittoors, seeking out dust and dirt. Then, t0- distances in the huge a/tiiscmbiy areas have forced superviveklurs to take to wheels and expediting is smoother and more efficient, thanks leiij lo battery vehicles. vil] The dependable fork lift, workto (horse of the fleet, is equally essen Eiitial in moving vital parts from reastIj'criving the stock and from stock to oon (assembly. Reliability and versatility pnjiirf the major desirable traits of the battery fork lifts so important at Boeing. Among the specialized vehicles is the immaculate, white, battery pow ered ambulance operated for NASA by the support services contractor at Michoud, Mason-Rust. Especially equipped for handling emergencies, the dependable vehicle can be oper ated easily and effortlessly by the trained medical personnel to arrive quicklv on the scene to render aid. Finally, keen public interest in all things in "space"' brings many visi tors to Michoud. and the smooth, quiet way to tell them the story is on board NASA's silent, battery pow ered tour train. And so the unorthodox and the commonplace find themselves side-byside, each complementing and neces sary to the other. ^ ho knows? The lead-acid battery, a century-old sensation, may yet find itself on the moon--certainly bevond anv dream of inventor Gaston Plante! DEEP SEA DC Transmission of sizeable amounts of electric power by submarine cable at high voltage (DC) has become in creasingly important in recent years. Six such cables are now in service or under construc'ion, 'll of them use lead-sheathed, paper-insulated cables. Solid, oil-filled and gas-filled type cables are used. High voltage direct current trans mission has two principal advantages over alternating current transmission: 1) smaller thicknesses of insulation Each 15-mile coil of cable for the English Channel cable was tested at 200 lev before use. can be used for the same value of peak voltage, 2) as there are no sheath or armor currents there are no sheath losses in energy. Consequently cables for DC are smaller and cheaper than cables for the same amount of AC. Here is a brief summary of the chief characteristics of the six new cables :* Sweden-Gotland 62 miles: single cable, sea water return; 100 kv to ground; power transfer capacity 20 Mw; solid-type cable; conductor cross-section 90 mm2. No faults due to electrical failures on cable. Four faults caused by ships' anchors. Cross-Channel, England-France 32 miles: two cables "go" and "re turn"; spaced 10 ft. apart to prevent magnetic effects on ships' compasses, in world's busiest shipping lane; 100 kv to ground; power transfer capacity 160 Mw; solid-type paper insulation; conductor cross-section (undersea portion) 340 mm2. No faults due to electrical failures, but both cables damaged in January 1962 by ship's anchor. No power cable faults to date. Sardinia-Corsica-ltaly (to be commis sioned in 1965) Sardinia-Corsica 5 miles; then overhead line section; then CorsicaItaly 56 miles. Two cables, both of same polarity; sea water return; 200 kv to ground; pow'er transfer capacity 200 Mw; solid-type paper insulation; conductor cross-section 420 mm2. New Zealand: North Island-South Island Link (Cook Strait). (To be commissioned in 1965). 25.47 miles: three cables, one spare; 250 Kv, using "go" and "return" cables, power transfer capacity 600 Mw; gas filled-type cable: conductor cross-section (undersea portion) 520 mm2. Laid and tested. Said to be longest, heaviest (1500 tons each) to be made. Konti-Skan Link, Sweden-DenmarkWest Germany (To be commissioned in 1965) Sweden-Laesoe: solid type cable. Conductor cross-section I undersea portion) 625 mm2. Made in lengths of about 6,500 yd, and factory jointed with flexible joints. Laesoe-Jutland: oil-filled type cable; two insulated conductors in a single flattened oval sheath with corru gated steel tapes acting as compensat ing devices; conductor cross-section 2 x 310 mm2. Made in lengths of about 984 yd, and spliced at sea. From "Solid, Paper Insulated Pipe-Type Cable for HVDC" by J. H. M. Sykes, (Overseas Editor) ELECTRICAL WORLD, June 15, 1964. LIA 2 64 21 SJuteiedtitty OdcU 'H tcU a&acit ^,ead Spec SPQR-VII? -- According to Gordon Gaskill, writing in the June Headers Digest, the ancient Romans had learned how to defeat electrolysis jn the submerged parts of their ships, -fhey lead coated copper nails to pre vent any reaction between the copper and the lead sheathing they used to protect the wooden hulls from marine worms. It keeps Hot samples cold! Not much different in appearance from an or dinary refrigerator, this small unit may want to contact Reo Scientific Corp., Williston Pk., L.I., N.Y. They cut off our water! Faithful read ers of LEAD will recall a 1961 issue describing the building of this foun tain and pool at American Airlines set some kind of a space record when, in July, 14 tons of it were lobbed into orbit. It was probably the largest quantity of any metal to head ``out there" so far, A little digging by LEAD editors also disclosed that 750,000 pounds of lead shot are used in testing of Titan III-C fuel tanks. Lead's heft can duplicate high-G stresses without countdown expense and fuss. Furthermore, when the big moment comes in a space shot, keep your eye on those Umbilical connec tions to the gantry--they're loaded with 1500 pound lead weights (25.000 pounds in all) for balance. Would we appear too smug if we set up a Space and Aeronautics Depart ment? for radioactively tagged materials is shielded with lead. If hot and cold pharmaceuticals are your dish, you terminal in New York. The effect of the local drought is spelled out in the coins the fountain collected. Plumbers' soil is a compound which could be called an anti-flux--it pre vents solder from tinning parts of the job that must remain solder-free. LIA's plumbing consultant, Homer Yetman, has tested out samples of soil offered by a new producer and pronounces it excellent. The supplier is Lake Chemical Company, 250 N. Washtenaw St., Chicago, 111. 60612. Lead A-OK for space -- Not to be up staged by exotic alloys, good old lead Thirty Years Ago As a consequence of confusion about ownership, surveying parties visited Howland, Baker, and Jarvis Islands in the Pacific and left engraved lead plates mounted on cairns. The How land plate, typical of all, reads: HOWLAND ISLAND LATITUDE 049' NORTH LONGITUDE 17643' WEST THIS ISLAND IS COLONIZED THIS 30TH DAY OF MARCH 1935 BY AMERICAN CITIZENS IN THE NAME OF THE UNITED STATES OF AMERICA NO TRESPASSING ALLOWED i -- ------ ~-- | CHANGE OF ADDRESS ADD ME TO YOUR MAILING LIST | (please circle one) CHANGE From___________ Name, title OF ADDRESS Company OR NEW Street READER Use This side of City, state, zip code the coupon if you have recently changed To____________________ Name, title your address or if you would like to be Company added to the mailina list for . IA 2 6^2 2 ..dr PLEASE CHECK INTEREST - Architectural & building - Design Engineer - Ceramics - Radiation - Other (please specit) wjjujjjjmjy ujjujjjju vumllLIBRARY OF TECHNICAL INFORMATION . The following publications are available free of charge unless otherwise noted. Send request to n f LEAD INDUSTRIES ASSOCIATION, 292 MADISON AVENUE, NEW YORK, N. Y. IOO17 NEW LISTINGS Something new to know about Cleaning "hot" parts ultrasonically lead & zinc supply and demand Authoritative examination of the short and intermediate supply ond demand prospects for lead and zinc. Two papers and discussion; thirty-five pages. Annual review--lead 1964 Detailed data and discussion of production, stocks and consumption. Review of events battery power New developments increase capabilities of battery trucks and truck programs. Four pages. GENERAL New uses for lead Design engineering data Piezoelectric transducers New uses for terne coated steel Use epoxies to line tanks with lead High speed lead plating Importance of lead in glass New electroceramic data Soldering and soldering alloys influencing or resulting from situation. Six teen pages. Lead paint systems for a bridge Six page reprint describes lead point systems used to protect San Francisco's bay bridge. Where to use feme coated steel Four page reprint summarizes the new indus trial uses for feme, a lead coated steel. Isolation of railroad vibration Histories of two installations in which lead BATTERIES Picture book of power batteries Industrial truck costs in a jiffy CONSTRUCTION Lead roofing and flashing 16 page handbook giving all standard lead roofing systems. High temperature lead joints Waterproofing with sheet lead lead sheathing for power cable Materials of construction review Corrosion data--lead & alloys Methods of lining lead tanks Cutting press vibrations Nuclear materials Radiation protection Anodes for cathodic protection Organo-lead job hunt vibration pads reduced ground borne vibra Pools and Planters fi tion in buildings. Eight page reprint. Isolation of buildings from vibrations FINISHES Practical lead sound barriers Twelve page manual gives specific wall con structions and performances, on-the-job and on-fhe-drawingboard details are included. Silver anniversary roofs lead work for modern plumbing $2 per copy; $1.50 for 10 or more. Lead paint systems for bridges Decorative finishes for lead Red lead bases paint systems Cathodic protection of offshore structures Four page reprint describing lead anode pro tective system for a large offshore mining complex. Lead plumbing systems ENGINEERING Ceramic permanent magnets Modern chemical construction Porcelain enamels: For aluminum low temperature steel Molybdate opacified enamel Glazes for brick UPON REQUEST, THE LEAD INDUSTRIES ASSOCIATION WILL BE GLAD TO MAIL "LEAD" REGULARLY, FREE OF CHARGE, TO THOSE INTERESTED, AND WILL COOPERATE WITHOUT OBLIGATION IN THE SOLUTION OF YOUR LEAD PROBLEMS. Reproduced by letterpress from lead type. rilNTXD IN U.S.A. g u id e -k a l k h o f f -b u r r , iw c NtW YORK, N. Y. Mail to; Lead Industries Assn., Inc., 292 Madison Ave., New York, N.Y. 10017 N Name, Title C Company Si Street c City, State, Zip Code Pi Please send_________ TO REQUEST LITERATURE L IA 2642 3