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BATTERY POWER ELIMINATES $200,000 REPAIR BILL Standby power protects Anaconda smelting operation s a plant manager, what would you do the tuyeres. In the event of a power failure, A if you were advised that a 20-second the compressors would shut down, elimi power failure could result in a $200,000 nating the positive air pressure in the repair bill? Obviously, insure your plant tuyeres. The tuyeres must be elevated above with a standby power system. That is what the surface of the mattes within 20 seconds was done at Anaconda's copper smelter in nr they would be filled and solidification Anaconda, Montana, where a giant 250-cell would take place. lead-acid battery automatically "cuts in" Normally, the rectifier changes 2300-v in the event of a power failure. If it didn't, AC power to 520-v DC power to run the after 20 seconds, the melted charge of 100-hp DC motors needed to elevate the copper bearing materials would flow into tuyeres. A lead acid storage battery sup the tuyeres i the tubes through which air is plies emergency power in case of a main blasted into the furnace l and solidify. It power failure. The battery is in parallel is reliably estimated that $200,000 would with the rectifier and the load and picks up be needed to get the converters back into the load automatically in the event of a operation. power failure. During normal smelting operations com The emergency power battery at Ana pressors force air into the matte through conda is housed in its own building. Cells are arranged in banks of 4 rows each, the rows being connected in series. Cells are inspected weekly. During every fourth week the battery is given an equalizing charge to make certain all cells are fully charged. The battery serves another purpose be yond its principal one. It continues to supply power to the motors should power from tiie rectifier be disrupted. During a recent 12-hour breakdown resulting from a yard accident, the battery operated the converter motors as well as the motors of two anode casting furnaces. Toss of power to these motors would also have entailed co.-tly repairs. Diogrom shows how batter/ is connected into the con verter/furnace power s/stem. Batter/ carries the load case of a main power failure or an interruption in powe from the rectifier. Lead acid battery supplies uninter rupted power to 4 converters and 2 furnace motors at Anaconda's copper smelter. telephone communications pathwav ^ gradually ^retching its way the Lnited States. The latest in 'l'jXjjl cable. Coax-22, is currently being 'V'Uii Brigham City. Ltah westward. j iK, cable ultimately will have a transmis,(in capability of 90.000 'imultaneous telephone conversations. Or in iinlbina0on. it will relay telephone con, r-atinn* and up to 300' picturephone ...... high --peed digital data, or color rdfV J-"i"n data. <'..ux-22. designed by Bell Telephone jii-.rat'U-ie- and manufactured bv Western uric Company's Baltimore Works, rep'ahie engineer ing. (For prior developments see LEAD. \ ol. 27. No. 4. 1963. and Vol. 30, No. 3. 1966.) Security and reliability favor coaxial cable for this vital communications link. Compared with microwave towers, the cable i.> less -object to propagation changes and interference. Coax-22 is 3-in. in diameter and contains 22 coaxial tubes (solid copper conductors within copper tubes). Conductors are sepa rated from tube- with insulating discs posi tioned at 1-in. intervals. In making the cable, the 22 tubes are stranded around a core of wire pairs used for signal circuits by a machine alrno-t half the size of a foot ball field. As with prior cables in the -ystem. Coax22 is protected by a lead sheath and poly ethylene jacket. The lead sheath is ex truded around the cable core to a thickness of 7/64-in. The sheath alone weighs 4.688lbs. per 1000-ft. Although lead sheathes can be extruded in almost any practicable length, it is limited in this installation to 1,300-ft. reel capacities. The cable is being buried to a depth of 4-ft. as still further protection from the ele ments. man-made damage, and other forms of potential attack. Cable laying is under the supervision of AT&T's Long Lines Department with the cooperation of the Pacific, Nevada Bell and Mountain Bell Telephone Companies. splicing op- 20/e on0tfhee sCboowoxn-2,2n. trenches ihe cable is *'n9 hid. HEARTBEATS HEARD MILES AWAY! new acoustic coupler made of cast Aleaded vinyl now makes remote com turn, can reply to the key punch, then the response is printed out. puter access possible by telephone since Any extraneous sound, of course, would the leaded vinyl serves to block out all ex make accurate data transmission impossi traneous sound. ble. Lead's sound barrier properties pro This coupler, made by TransCom. Inc.. vide the necessary sound blockage. Users Bloomfield. Connecticut, of a material de can "converse'' through the acoustic coupler veloped by the Ferro Corporation. Norwalk, even in such normally noisy situations as accommodates a standard telephone hand may occur around a pay telephone or near set which serves as the transmission device. a plant telephone. The cast leaded vinyl Using a key punch unit similar in ap efficiently blocks such sounds from enter pearance to a typewriter, the operator can ing the mouthpiece, \on-leaded materials '`converse" electronically with a main com puter bank thousands of miles away. The telephone is set into the acoustic coupler; signals originating in the key punch are audibly transmitted over the phone lines to the main computer. The computer, in r would require up to twice the thickness this coupler in order to achieve equiva)e^ noise insulation. Other immediate uses for the acousp coupler include transmissions by Co phones and the rapid transmission of doq, ments, photographs and other grapfjj data. A fascinating potential use of tj,, acoustic coupler is the transmission of eleo trocardiograms from one locale to another Here, a life could depend on the immediat, transmission in a completely noise-free en vironment. LEAD MAKES TRACTOR ENGINE NOISE TOLERABLE awn-to-dusk hours at the wheel of a D huge, heavy-duty tractor are normal ceptabie and safe ranges, even with long exposure. in the agricultural industry. These pro Egging uses a sheet lead polyurethane tracted hours mean long exposure to tractor foam sandwich material to block engine engine noise and the possibility of un noise from entering the tractor cab. The healthy effects on the driver's hearing and material is installed under the operator's nervous system. The Egging Company, Gurley, Nebraska, sound control specialists, have designed systems for agricultural and other large tractors that reduce decibel levels to ac- VIBRATION DAMPING COMPOUND platform and on the back side of the fire-1 wall. Using other techniques in conjunc-l tion with the lead/foam combination Egg ing effectively reduces noise transmission I by as much as 10 db *`A" scale within the cab (approximately 50%). The system illustrated is designed spe cifically for tractors. Other systems are 1 adaptable to many different types of nor-: mally noisy machinery. FOAM SOUNO ABS0R8ER LEAD-FOAM SOUND BARRIER LEAO-VINYL SOUNO BARRIER - TWORK . indoors and out ^ Majr Museum Goes Under Lead Cover A ^ Of i|tr<-ugfiout history graceful works of art When famed architect Louis I. Kahn, the as a waterproofing membrane, and is dur ent bee na made of lead or associated 1971 recipient of the American Institute of able. ai. The terraces of the hanging Architects gold medal, specified sheet lead Exposure to the elements will give the , ih the met Babylon were it nderlaid with for the roof of his Kimbell Art Museum, lead roof a soft neutral gray patina that waterproofing. Centuries later, aesthetics entered into his decision. 4*I ex will blend well with the architectural envir KimheJl Art Museum in Fort has been given a lead roof pect it to look like pewter and give off a -ihery light." he said. onment and have the rich look one natu rally expects of an art museum housing Practical considerations were also a millions of dollars of precious artworks. factor. Sheet lead is easily worked, serves Sheet lead, alloyed with calcium to improve strength, and weighing 3-lbs. per square foot (3/64-in. thick) was used to cover the cycloid roof. To keep the roof in character with the architectural form, unobtrusive flat locked seams were used. ( the first fold on the trimmed sheet lead is applied with a hand brake. This method insures uniform folds throughout. LEAD GOES TO SCHOOL "We are called upon to make recommendations to architects to preclude sound transmis sion problems in their projects. Our recommen dations must be consistently achievable within reasonable economic parameters. When you consider the low installation costs and the high performance level of lead, you can then under stand why we consistently recommend its use in critical areas. We must, also, when making a recommenda tion, take into account the "error potential" on the part of the installing mechanic. Reason able care combined with a minimum of super vision assures proper utilization of the material. In short, you can soy that lead is inexpensive, predictable and efficient." Gilbert L. Phillips, Jr. President Gilbert L. Phillips, Inc. Acoustical Contractors opulation growth and the mass move Pfrom the cities to suburbia have neces and duck raisers, grew in population in the two decades between 1950 and n* sitated the building of new schools at a . . . from 276,129 to 1,116,672 population J phenomenal rate. And the new schools Representative of the new school desj themselves, are frequently designed with trend is the Thomas J. Lahey School 1 multiple use flexibility to help compensate Greenlawn. The one-story building is ^ * for rising costs and a money supply not al signed with clusters of classrooms arouQ(j ways adequate to meet school demand. a central core. The core contains admit^ - These flexible-use schools of the 1970's trative offices, gymnasium and a combir^ require noise control systems to avoid cross tion auditorium/cafeteria. feed of noise between classrooms and other Architects Coco & Smith, Hauppaug^ areas. Privacy and quiet remain essential New York, created a design that wouj^ to school environments, whatever changes offer individual classroom privacy COt^ may be wrought in school design. A series bined with the ability to convert classroom, of schools and educationally-related build into a large teaching area. Folding part*, ings being constructed on Long Island, tions effectively divide the area between New York, illustrate the need for sound the floor and the drop ceiling in the cla&j. control systems and the control methods rooms. To prevent noise from passing ov^ being adopted. Long Island, of course, of the partition, in the area between the drop fers a highly visible example of population ceiling and the roof, the space between shifts. Suffolk County, once the sparsely- partition track and ceiling '*1" beam wjj populated haven for farmers, fishermen sealed with 1-lb. (1/64-in. thick; lead. A The Thomas J. Lahey Slementary School, Greenlawn, New York. Sheet lead plenum barriers between classrooms assure quiet for the 1,200 pupils, when they want it. B The Lahey inslallalion includes sheef lead between movable partition rails and ceiling "I" beam. Penetrations for piping are made easily with lead. C The entire interior walls of the audiometric room at Lahey were covered with sheet lead so no extraneous noise would affect hearing tests. D The Bellport Junior High School, Bellport, New York. Addition of two wings housing classrooms and gymnasium in one. auditorium in the other, called lor 1-lb. sheet lead sound barrier systems. LIA26622 1 1970 tion desi 8n ool is <ie. lrunr| iminis. mbina. pdug(*( would corn rootris Parti, -tween class8 over e drop en the m was lead. acoustical contractor, Gilbert L. The - Inc., is a stfng advocate of lead ^*^sound barrier material because of its ** a.tiveness and easy workability (see e"eL \t the Lahey School the firm was bl'^ to make a speedy installation. The jb lead was wrapped around 1-in. x 3-in. j itrjps which were in turn wedged * piace against the lower flange of an in!:'beam The bottom portion of the sheet j was -ealed to the partition track and eJ ..J with 3/16-in. wood wedges. Sheet .court ioal h'ints were easil,y o. verlapped and j \ecessary penetrations tor pipes, nduits- etc. were easily managed by slitthe lead sheet and sealing with tape, jr i-ewhere at the Lahey School sheet I ,aj was used above the entrances to class- 0In- as a noise barrier and to completely mndproof an audiometric testing room j for testing pupil hearing prior to en rollment. To obtain the necessary quiet for testing, the entire walls of the audiometric room were covered with 1-lb. (1/64-in. thick) sheet lead. The lead was held in place by 1-in. x 3-in. batten strips on 12-in. centers. After the application of the sheet lead, the walls were finished with an acous tical board with sound absorbing glass fiber behind the hoard. In Bellport, New York, two wings were added to the existing Bellport Junior High School, one wing consisting of a classroom and gymnasium complex, the other, an audi torium. Sheet lead was again used exten sively as a sound barrier. The gymnasium, designed by the archi tectural firm of Fredrick E. Allardt, Jr., who also did the other additions, may be divided in two by means of a folding par tition. Sheet lead was used to block the flanking path over the top of the folding partition. A similar noise attenuation system was used to block sound transmission over the tops of folding partitions in the new class room area. Clusters of four classrooms can be opened up into a large single room area by the use of manually-operated partitions. The new auditorium is also designed with flexibility in mind. A folding partition sepa rates the general auditorium into two areas, one with the stage, one without. Here again sheet lead is used over the motordriven partition to block sound. Two other lead acoustical systems from the Long Island area are found at the New Lane Elementary School, Hauppauge. where the music practice room has been engineered for quiet with sheet lead, and the Sayville. New York, School Adminis tration Building. The latter has been de signed so that all executive and executive secretary offices, library and board room are outfitted with sheet lead attenuation systems that achieve a sound transmission class ( STC l of 40. red wings id for ^ Acousficot contractor workmen install sheet lead at Sayville with relative once Wa'ltab`l`ly 'rad provides easy access for piping and other protuber- j fke Heliport auditorium can be divided into two areas to accommodate two ki L0n*w* functions. Sheet lead is used over the motor-driven partition to oc* sound transmission. G The Sayville, New York, School Administration Building has been designed to provide a quiet environment for the staff. H The Bellport gymnasium divides in two with o folding partition. Lead blocks the flanking path over the top of the partition. I All executive offices, /ibrary and board roam at Sayvi/le have !-(b. sheet lead sound barrier systems that achieve a sound transmission class of 40. LIA26623 erne, a lead and tin alloy coated steel, Terne is now available in both sheet and Tdates back to the 18th century, when coil form. Terne sheet is made in 12 to 28 it was devised as a less expensive substitute gage thicknesses, in widths up to 52-in. for tinplate. Two centuries later terne has and lengths up to 144-in. Terne coil is made emerged as an old product with a bright in 14 to 28 gage thicknesses, in widths up future. The combination of steel's strength to 52-in. with lead's corrosion resistance, solder- Terne is a "natural" for deep drawing or ability and paintability have made it an in severe forming operations. The lead-alloy creasingly popular metal for applications coating acts as a built-in lubricant and is requiring deep drawing, detailed configura easily welded or soldered. tions, or need for extra resistance to corro- Gasoline tanks made of terne plate are standard. Other automotive parts, radio and television chassis, parts for outdoor equipment such as tractors, lawn mowers, snowmobiles, outdoor lighting, roofing, all have been made advantageously terne. The expected development of a I foil could open important new mart automotive radiator cores, special pack ing, moisture proofing and even minor raj ation barrier applications are a possibilM Predictions are that terne will assn more importance in the future. New de opments in the metal itself; an awarene that terne improves the life of certain pm ucts; its ease of joining; its paintabilitj ... all influence its selection as a desig material. flodio and TV chassis represent one product group that favors the use of tern because of the detailed configurations require ment. iwukMMiifU Photos: Courtesy Basic Steel Corp. This air defuser for a he0v equipment otr c/eoner is made ; with relative ease. Automotive radiator side mounting brackets, along with gasoline tanks, oil filters and air cleaners are some of the terne applications common to the automotive market. This deep drawn small engine air cleaner and cap are made of terne. The ruler indicates the small sizes within which terne can readily be formed. A kerosene stove wick holder utilizes all of feme's special capabilities. The wick holder is both deep drawn and perforated, feme's corrosion restsfence is vital to the part's serviceability. 8 LIA26624 T MERCHANTS REFRIGERATING El e c t r ic s d o a c o o l j o b i(,f signt ui anu automobile radiator | .pouting steam on a hot summer day is pible evidence of the heat generated by ,he internal combustion engine. That en'ilIU, generates the same heat, indoor or 'lU, no matter what the external temperatare For that reason, and because lead ,oid battery-po wered electrics pose no con; j rn i n 3 *n exhaust problems, they offer many advantages to handlers of frozen Merchants Refrigerating Company, nainvule handler of refrigerated and frozen mml- uses battery-powered vehicles in all m-tallations. The company's largest and n,,,,t modern facility in Secaucus, New yersev. moments away from New York ,;ilv. i- unofficially known as '`Frozen Food Litv." Here a fleet of 51 electric fork lifts ha,n,d- le .p.a..ll.et1iz__e_d .l.o.1a1d.s a. t. the rate of 26 Bill Bvrne. Engineering Superintendent of the Secaucus facility, explains Mer chant's use of electrics there, as well as at its other plants, as being based on several factors. Because they are handling food, they must use equipment that poses no po tential contamination problem. Also, by using electrics, the company avoided the monumental problem of ventilating freezer areas to accommodate internal combustion engine vehicles while maintaining --5F. Most communities regulate the distance at which fuel must be stored away from a warehouse for compliance with fire regu lations -- an added operational expense. And, Mr. B yrne points out. maintenance costs for electrics are low. Electrics are clean in operation. And not least, they have no start-up problems in sub-zero environ ments and pose no radiator problems. The fleet at Merchant's plant consists of 24 rider-stacker straddle trucks used in the freezer room to handle loaded pallets in the high bay racks. Nine electric fork trucks are used in the dock area for loading and unloading. A total of 8 units having 3-ft. lifts are used tor rail car and truck unloading. Truck docks are served by 10 electric pallet transporters with just enough lift to raise the load off the floor. Two stacker - rider battery - powered electrics enter the freezer room through an automatic door. Trucks have no problems in even --5'F. temperatures. This narrow - ais/e battery - powered electric stacker lifts to 216 inches and operates in the --5aF. temperatures maintained in the freezer room at Merchant*. Straddle, walker-type electrics unload trucks and rail cars. Product is held on the dock for checking before delivery to the freezer. 9 COPPER REFINERY CELLS LEAD-LINED AGAINST ACID ATTACK outhwire Company, the world's larg S est independently owned producer of in resisting corrosion, the sheet lead in stallation costs were lower than they would copper and aluminum rod, has just opened have been for any other rigid lining mate a new 40,000 ton per year capacity copper rial. We also favored lead because it can refinery in Carrollton. Georgia. The refin easily be repaired if necessary; and when ery was added to the Southwire complex to it becomes necessary to replace the linings, assure a continuous supply of copper for the old lead linings will have a recoverable the company's manufacturing system. scrap value." The 145.000 sq. ft. refinery building The electrolyte cell bodies, called shells, houses 520 electrolytic cells, each measur are made of concrete and the inside treated ing 4 ft. x 4 ft. x 121 o ft- Approximately with a bituminous coating prior to insertion 500 tons of 8-lb. (Gs-in. thick) and 16-lb. of the lead lind This protects the sheet i 14*in. thick) antimonial sheet lead were lead from any ;.ee lime that still may be u.-ed to line the cells. The lining gives nec present in the cement. essary protection against corrosive attack The sheet lead linings are formed over by the sulphuric acid/copper sulphate a mandrel: one sheet serving to make the electrolyte. bottom and two ends; two additional sheets Mr. William Burson. Plant Manager, make the sides. Once formed, the lining Copper Division--Southwire. reports that and mandrel, clamped together, are in a number of lining materials were tested verted and lowered into the cell. The for the electrolyte cell before lead was mandrel is removed; and as a final step, selected. "Besides its proven effectiveness the joints in the sheet lead lining are welded (burned) to form the finished elec trolyte container. The cells at Southwire are supported on tubular columns 12 ft. above grade, so that piping for the electrolyte is readily ac> cessible for maintenance. Lead is also used at Southwire to line the steel holding tanks for electrolyte storage These tanks are in a recirculation and fif. tration bay adjacent to the cells. Again the lead lining's purpose is to protect the tanks from acid corrosion. Corrosive su/p/iuric acid/copper sulphate electrolyte c/rcu/afes through the 520 electrolytic cells at South, wire at 150F. Almost 500 tons of lead line the ce/fj as projection against the e/ectroiyte. The Southwire copper refinery at Carrollton, Georgia, covers M5.000 square feet. The refinery assures an adequate copper supply for the company's copper rod manufacturing needs. eiec. ;,J on > that y ac. >e the rage. 'd fil. t the :,rlyte South. LEAD FEATURES IN WHALE OF A STORY W'hale vertebrae, lead and glass are the strange bedfellow mate rials that make up this unusual and attractive coffee table. The table was designed by Arthur King, prominent New York City jeweler and jewelry designer, at the request of shop patrons. Impressed by Mr. King's use of lead as the major decorative ele ment in his shop, customers commissioned him to design lead decorated furniture. The coffee table is one of his first furniture designs. JUNIOR JET SET GOES ELECTRIC Kids no longer travel under their own steam. Now they can ride an electric mini-cycle, powered by a 12 volt lead acid battery. Manufactured by American Mobile Vehicles, Inc., the mini-cycle can attain speeds up to 30 mph and travel up to 50 miles with as little as one quick pickup battery charge en route. It can't be used on highways; but it provides ideal transportation for campuses, beaches, resort areas, or anywhere else vehicle regulations permit. Not least: it's fume-free and almost noiseless. A SOUND CAMERA THAT DOESN'T TALK BACK Film makers have found that the whirring noise made by motion picture sound cameras is a problem with lipsync clo-e-ups. The noise of the camera's shutter, gears and motor is picked up by closely-positioned sensitive omnidirectional microphones. Ogden Lowed, a New York City cinematographer, solved the problem with leaded vinyl. He con structed a blimp of cardboard and glass fiber to enshroud the camera body and lined the enclosure with powder-filled vinyl plastic sheet. The whirring noise has ceased to be a problem. FOR CHANGE OF ADDRESS PLEASE WRITE IN NUMBER FROM TOP OF ADORESS OR ATTACH OLD LABEL ADD ME TO YOUR MAILING LIST (please check one) PLEASE CHECK INTEREST Painting Health & Safety Q Architectural & Building Name, Title Company Street City, state, zip code Ceramics Chemical Engrs. G Battery Power " Miscellaneous (please specify) Lead in glazes Reprint from American Ceramic Society Bulletin. Six papers on the subject of iead release from ceramic dinnerware glazes. Charts and tables. Twelve pages. B-10 Lead a major factor in new machinery noise suppression systems Description of techniques used to tower machinery noise levels with lead and lead co.moosrtes. Lists machines that normally exceed noise level allowed by WalshHealey Public Contracts Act. Two pages. J-9 Sheet lead plenum barriers Detailed description of acoustical plenum barriers and how to install them. Mate rials and installation procedures described and illustrated. Eight pages. J-10 Techniques for reducing machinery noise Reprint from Pollution Engineering details materials and solutions for reducing ma chinery noise to acceptable levels. Spe cifics given for several machine types in common usage. Illustrated. Four pages. J-ll Testing storm drain joints: A research report Results of -rsts <nv>. ngating pressure limits for lead oakum ;3iked pipe |Oints m high rise building service. Tables. Two pages. D-6 ARCHITECTURAL Waterproofing with sheet lead A description of the use of lead as a membrane waterproofing material for lin ing pools, planters, fountains, shower stalls and floors where positive water proofing is required. Architectural details and specifications are included. Eight pages. A-2 Lead roofing and flashing Detailed instructions on the simplest and most usual methods for forming or join ing lead for roofing and flashing appli cations. Complete specifications. Diagramatic drawings. Sixteen pages. A-5 PAINTS Follow the safety line with chrome yellow Formulations and suggested applications for chrome yellow safety paints. Illus trated. Eight pages. M-S Lead plumbing catalog and specifications Specifications and details for the use of lead m piumbmg. Waste connections, shower and safe pans and chemical lab oratory drams are covered. Four pages. D-2 CHEMICAL CONSTRUCTION & CORROSION PROTECTION Corrosion resistance of lead in chemical applications A chart presentation of the corrosion re sistance of lead and its alloys against 188 common cherrucais from 0 to 300 0sF. Six pages. H-3 Lead in modern chemical construction Reprint from Encyclooecia of Chemical Process Equipment. Describes installation, proper design application, and testing of iead unings. Twelve pages, illustrated. H-l BATTERIES A primer on the lead-acid battery A condensed story of the principles of the lead-acid battery and its chemistry, in cluding some of the fundamentals and definitions of direct-current electric en ergy. Two pages. L-6 Industrial truck cost calculator Three nomographs permit estimation of costs for gas vs. battery powered indus trial trucks in two or three minutes. Twelve pages, charts and tables. L-l CERAMICS Facts about lead glazes for art potters and hobbyists Detailed information on the proper formu lation, firing techniques, handling, etc. of lead fluxed glazes used by ant potters and hobby ceramists. Illustrated. Sixteen pages. M-21 SOUND BARRIERS Director of acoustic specialties Summary of available materials for sound insulation by barrier, damping and absorbtion methods. Sixteen page list of materials by brand name and manufac turer. Eighteen pages. J-4 Ways to reduce press vibration Two installations of lead asbestos pads to reduce heavy machinery vibrations. Sec tional drawings and loadings are given. Two pages, illustrated. G-l Lead asbestos anti-vibration pads Specifics on lead anti-vibration pads in cluding design and sizing, specifications for the sub-contractor, and list of pad manufacturers. Three pages. G-3 CABLE SHEATHING Lead-covered underground cable use increasing Reprint outlining a maior utility's recent experience with lead sheathed underground cable. Details on wnere this type cable is desirable. Graphs. Four pages. C-2 GENERAL Primary lead production areas in the U.S. For schools, libraries. 11 "x 14" map show ing locations in U.S. of most lead smelters and refineries, and lead mines. M-ll Lead as a modern design material Design engineering catalog with specifics on lead characteristics, benefits, avail able forms. Details on lead use as coat ing. radiation control, sound control, and m soldering, ceramics, etc. Illustrations, tables, graphs. Eight pages. M-15 The new lead belt Reprint of article details operations at the new lead belt in Missouri. Booklet de scribes activities at four mines, four con centrators and three smelters. Twelve pages. M-16. Use of lead in the automobile Reprint of article from Metals Week dis cussing in detail the various applica tions of lead in the automobile. Four pages. M-17 Lead--The "Clydesdale" workhorse in space Reprint from Space World detailing the applications of lead in space exploration. Illustrated. Four pages. M-19. The U.S. Lead Industry--1970 An annual review of activity within the in dustry that contains a genera! summary for the year and a series of charts and tables giving current statistics on lead production and consumption. M-20