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FILE NAME: Trade Publications (TR) DATE: 1948 Dec DOC#: TR050 DOCUMENT DESCRIPTION: Trade Journal Article - Industrial Sand Producers Meet DECEMBER, 1948 Bror Nordberg Bdrtor R o c k P r o u i:c t s THE INDUSTRY'S RECOGNIZED AUTHORITY VOL. 51, No. 12 N a th a n C. Rockwood e d ito ria l C o n su lta n t This Month We Hear v.v . 67 Problem s in Producing "M odern" Specification A ggregates Bror Nordberg 71 R ocky's M otes -AB ack-Tracking M ay H elp S o lv e a Problem 73 Labor Relations Trends 75 The Personal Side of th e N ews 77 Industry News 81 Hints a n d Helps 84 N ew Mafchiftery 6 Perfect? A ggregates an d Concrete Nathan C, Jtocfcwood 88 Safety and O perating ideas National Lime Association, O perating Division, holds successful m eeting--^inspects M arblehead Lime Co. plant 93 M anufactured Sand fo r Large Concrete Structures Suitable types of quarry material, and ; plant, detail for production of stone sand to m eet Government specifications1 . : " George C. Hawkins 98 Sand for W olf Creek Dam Product from cone crushers, rolls and hammermiHs blended into sand frotn w hich excess ilhes are removed by air separation Bror Nordberg 102 Progress in P lant D evelopm ent 22 pages o f pictures show ing ttew p la n ts and in sta l lations typifying trends . 1D5* 127 R esearch in C oncrete a n d C em ent ; E x p erts cdmihenfc on accom plishm ents of research to; date, and suggest ideas for future study to improve durability o f conefeie : ; Industrial Sond Producers M eet Bror Nordberg 128 N ational T n d u stria l iland A ssociation onsKSfafs b y - . > gienei-TegisiaMpp; f te ijp t fates, labor and technical problems t - : 134 S afety's Par? in Production Ceiaehtr and i^qarty; Section Meetings of N ational Safety CongresS develop some practical suggestions for reducing accident i , t . Sediack 137 P.C.A. C om m ents o n R esearch , - a4Allen Bates 138 Industrial M inerals Conference \ Stress Commercial A spects o f Non-metallie a t A LM E. M eeting, St. Louis, Mo. M ining Congress Convention D redging problems, stripping Operations among topics discussed M inerals drilling Scotch Block P la n t Hetwry i. De W eerdt K40 1421 193 C o n crete --C entral-M ix, R eady-M ix, Block Dual batching p lan t o f Louisville. Crushed Ktpne Co., Louisville, Ky., proportions epft|fhte tn atiriafc auto m atically to concrete products `p la n t d r t e ce n tral ihixer charging ready mix trucks Concrete Placed by Precision V ibration Process perfected in Sweden enables A m erican p ro ducer to m anufacture rem arkably-high strength con crete gratings, using a harsh mix and water-cem ent ratio of 0.4 M. W. Loving H andle Ready-M ix an d C oncrete M aterials ML B. Lenbart 164 196 199 2 ROCK PRODUCT S, D e c e m b e r 1948 W a lte r B. le n h a r t , Associate Editor D ovid M o lin e, Associate Editor M. K. Sm ith, A ssistant Editor J. S edlock, A ssistant Editor Contributing Editors V ictor J. A lb e D r. F. O . A n d e r e g g M. W . Loving Jam es A. Barr, Jr. Hom e Office M o rg a n K. C o ttin g h a m , Ad. Manager H. M. G o o d e n o w , D ir. of Circulation M ary A. W h a le n , C irculation Service M. S. H e n d ric k s, Dir. of Research C. M . H o n c o ck , P ro d u c tio n M anager C. P. T eo ts, Field R epresentative District Offices Eastern A re o -- Richard Y. Fuller, M anager; John F. LockRt, Assist ant, 522 F ifth Ave., New York 18, Tel. M urray Hill 2-7888. C e n tro l A re a -- R. P. Keine, Manager, Hanna Bldg., Cleveland 15, Tel. Mam 4362. M id w e s t A r e a -- R. N. Oleson, Rep resentative, 309 W. Jackson Blvd.. Chicago 6, Tel. H arrison 7-7895. W e s te r n A re o -- !.. C. Thaon, Man ager, 309 West Jackson Blvd., Chi cago 6, Tel. H arrison 7-7890. P acific A r e o --Duncan S cott & Co., Mills Bldg., San Francisco 4, Tel. Garfield 1-7950. In Los Angeles 13, 408 Pershing Square Bldg., Tel. Michigan 6203. L o n d o n , E n g la n d -- Harold F . Charles, Managing Director, Maclean-Hunter, Ltd., Sun Life of Canada BldgT ra fa lg a r Square. London, S. -1- R0CK PRODUCTS is published monthly J > MACLEAN-HUNTER Publishmp Corporation. W West Jackson Blvd.. Chicaoo 6, Illinois: or?" Hunter. President; E. R t au ey Vice J. L. Frazier, Secretary. Copyright, 1B48. t " T e as second-class matter. Jan. 30, 1936, at the capo, III bust ottice under the act of " 1ET79. Additional entry at Milwaukee, Wrs. ROCK PRODUCTS is indexed repu.arly ay neering Index Inc SUBSCRIPTION INFORMATION Subscription Price: United States andl fn ie!Stpr,'i!e Canada one year, $2.00; two years, S-v , (w0 years, $4 00. Pan American, one F*8! ; for. years, $7 00: three years, $10.00. A ll ft* (hrft eipn, one year. $6 00; two years, copies years. $15 00. Twenty-live cents for sinsie Indexed in the Industrial Arts Index. jut Canadian subscriptions and remll l|2 t f f ,r T o p 0 in Canadian funds to ROCK PRObUC Box 100. Terminal 'A ." Toronto. Canana. To Subscribers-- Date on wrapper. '" ` 'P e^r,tins> with which your subscription .. ,, n!w to have address ebanyed, Dive old as address. Industrial Sand Producers M eet N ational Industrial Sand A ssociation Considers hygiene, legislation, freight rates, labor and technical problems Nearly 100 m em bers and wives attended the semi-annual meeting of the National Industrial Sand Asso ciation, October 20-22, at the Green brier, W hite Sulphur Springs, W. Va. According to usual custom, the program w as so arranged th a t most of the business discussion and form al meetings were transacted in morning sessions in order th a t tim e would per mit maximum participation in the splendid and diversified outdoor recre ation facilities fo r which The Green b rier is fam ous. Ladies' and Men's golf tournam ents were held, there was a bridge tea for the ladies, and enter tainm ent each evening fo r all in attendance at the meeting. The A ssociation will hold its 1949 annual meeting at The Homestead, Hot Springs, Va., May 11-13, and will again have a Fall meeting a t The G reenbrier, October 12-14 in 1949. Principal topics discussed w ere de velopments in th e field of in d u strial hygiene, recent actions in the States affecting w orkm en's com pensation in surance, the recent decision of the United States Supreme Court in the cement case which invalidated basing point m arketing, current traffic prob lems of the industrial sand industry, technical problems and labor legisla tion. George A. Thornton, O ttawa Silica Co., O ttaw a, 111., presid en t of the National Industrial Sand Asso ciation, Sterling N. Farm er, Sand Products Corp., Cleveland, Ohio, vicepresident, and C. M. H ardy, H ougland and Hardy, Evansville, Ind., treasurer, w ere presiding officers fo r th e th ree meetings. Technical Problems Following reading of the financial report which disclosed the Association to be in sound condition, consulting engineer Stanton W alker briefly re ported on a num ber of technical problems. F irs t he told of conferences a specially-appointed committee has held with engineers of the St. Regis P a p e r Co. to discuss m odifications of bag packing m achinery for the pur pose of reducing dust exposure in packing operations. Several modifi cations to improve resistance to ab ra sion and th e stopping and startin g mechanisms of packing machinery, which would decrease m aintenance and dusting, have been discussed hut no decision has yet been reached as to the feasibility of suggested engi neering changes. Producers of ground industrial sand, according to Mr. W alker, require more than one-half million bags per year fo r packing their products. The 10,000 copies of the Manual on S afety in S an d b lastin g , originally printed, have been exhausted, and the Manual is to be reprinted. In his discussion of the testing of foundry sands, Mr. W alker enum er ated the various committees active in studies of grading, fineness, core tests, green strength and other properties of foundry sand. Much attention has been given the degree of reproduci bility of tests under various conditions and, in com menting on work being done to standardize a te st sand, Mr. W alker presented data furnished by the Naval Research Laboratory and R eloxm 9 o t fhe club house ore, le ft to rig h t, Mrs C. R. W olf, M rs. Jesse T. M orie, Mrs, J. M, Strouss, Mrs. A rnold H. T onxer an d Mrs. A. B. Schlesinger 134 BOCK PRO DU CT S . D e c e m b e r . 1948 also made available from various pro ducers of foundry sands. D ata as pre sented showed the effect of method of sieving on mechanical analyses of sand, of re-use of sample on mechani cal analyses of sand, the comparison of mechanical analyses of sand for first use w ith different samples from th e sam e lot, th e effect of the sieve sh ak er on m echanical analyses of sand (cumulative and separate percents) mechanical analyses of the same sam ples of sand on sim ilar equipment in different plants, and the effect of type of sieve shaker in different labora tories on mechanical analyses of sand. The various tests under the several conditions in g eneral did not disclose much variation in fineness number although there were significant differ ences observed in critical sizes as screened on v ario u s sieves. Freight Rates T. C. M atthew s, ch airm an of the traffic com m ittee, reported briefly on the effects, should recently-requested f u rth e r increases in fre ig h t ra te s be granted rail carriers. The Association and its special committee believe th at discrim ination would be the result if freight ra te increases requested be granted fo r bonded molding sand when shipped in box cars. The result would be a 15 p ercent higher rate th a n fo r sand as shipped in open cars. Wm. W. Collin, Jr., Commerce Council fo r the Association, said th at the latest requested increase in freight rate s, 13 p ercen t over present rates, would b rin g ra te s to a level 194 per cent of th e 1937 level, or 77 percent over the 1945 level. Actually, the 13 p ercent increase would be 20 per cent over 1945 rates. Commenting generally, he said th a t the I.C.C. has been granting increases much more readily and in increasingly larger am ounts than in the p ast which might mean a disposition to m aintain the railroads in sound condition a t any cost. The alternatives, should volume of traffic decrease, m ight be govern ment control of the roads, bankruptcy or subsidies. Labor-Legislation Executive secretary V. P. Ahearn, in bis consideration of labor m atters, discussed regulations announced by the A dm inistrator of the Wage and H our Division follow ing th e decision of the United States Supreme Court in the Bay Ridge Case, the LaborM anagem ent R elations A ct of 194T, and rep o rted on th e sta tu s of collec tive bargaining negotiations in (be Clor' of ir indi ' case has exce pan sion acri mus call day don : pas or 5 p the pai eac Th. tha be ] La by inc Th pr. at all its in we : pe * i industry. R eferring to the Bay Ridge case, Mr. A hearn said th a t a company has no problem unless work is in excess of 40 hr. per w eek: th a t a com pany then becomes subject to the deci sion even if shipm ents are not made across S tate lines. The Bay Ridge case must be considered if labor contracts call fo r tim e and one-half for S atu r day w ork and double-time for work done on Sunday, or where premium pay is provided for holidays worked or for w ork before 7 a.m. or afte r 5 p.m. on reg u lar work days, etc. For the purpose of computing over-time payment due, it was pointed out th at each week is considered separately. The safe course recommended was th a t the payroll work week in all cases be s ta rte d a t 12:01 am . on a Monday. Recognition of the Taft-H artley Law and its rulings is being evidenced by th e labor contracts being signed by industry members, said Mr. Ahearn. The law will not be repealed and probably is unlikely to be changed, at least radically, because it is basic ally sound. Mr. Ahearn emphasized its soundness by pointing to provisions in th e law th a t protect employes as well as em ployers and which do not perm it individual w orkers to be help- Amold H. In n re r, New York, N. Y ,, taker o whirl of th e movie comero less in the hands of unscrupulous union leaders while also protecting the public interest by outlaw ing violence. In com m enting on collective b arg a in ing, Mr. A hearn said th a t agreem ents in the industry are generally sound. He emphasized th a t an individual employe m ust sign an agreem ent in order for an employer to deduct union dues from his com pensation. In no case should special union fees, assess m ents or fines be deducted. At the conclusion of the meeting, Mr. A hearn was asked to give his comments on the national and inter national picture and to predict what is in sto re fo r in d u stry in the imme diate future. He said th a t with a record-breaking present employment of 62,000,000 persons, th ere is no pool of men available for w ar or defense Mr. ond Mrs. Henry Roeser, Jr., MtHvilie, N. a t the first tee preparations. He anticipates that th ere will be competition fo r men in view of the present international situ ation, between industry fo r civilian production and for w ar preparations. There will also be competition for m aterials. The domestic civilian econ omy will suffer. He believes th at pressure for domestic controls of all sorts will grow stronger and th a t price controls will be enacted. A new governm ent would even have found it necessary to make a choice between essential and non-essential industries under the pressure th a t is growing for enactm ent of controls. There will be pressure for m anpower controls in 1949, predicted Mr. A hearn. There will be emergencies but he does not believe there will be w ar in th e imm ediate fu tu re unless be cause of unforeseen incident. In view of conditions, he urged th a t more use be made of handicapped workers, th at an effective working force be built th a t can be m aintained, th a t plants be put in first class shape and th at ade quate but justifiable inventory of re pair parts be accumulated. Legislation Covering Com pensation Recent actions in the S tates which affect workm en's compensation insur ance w ere reviewed by Association counsel Theodore C. W aters. The principal focus has been in the State of New Jersey w here two bills had been introduced which would amend BOCK PRODUCTS, Decem ber, 1948 M r. dnd Mrs. E. J. Compbetl, Thoyer, W . Vo., stop o moment for the comero enroute to dinner th e New Je rse y W orkm en's Compen sation Act, and where the New Jersey D epartm ent of Labor is preparing a code relating to rules and regulations for the control of silicosis in industry. Mr. W aters who has been negotiat ing with the New Jersey Departm ent of Labor and, with Theodore F. Hatch of the Industrial Hygiene Foundation, has recommended changes to the pro posed rules and regulations covering silicosis control m easures, which are being given consideration. The pro posed code was first draw n up in June, 1948, and w as subm itted to the New Jersey State Industrial Safety Committee for comment. Comprising the committee were representatives of m anufacturing concerns, insurance carriers and specialists. The second d ra ft w as subm itted in A ugust, 1948, and a third d raft is now being written preparatory to form al action. Mr. W aters believes the code will be draw n up in final form on or before J a n u a ry 1, 1949. I t will be applicable to all industry operations and all industrial sand producers m ust com ply w ith its provisions. In Mr. W aters' opinion, industry will be perm itted reasonable tim e in which to comply. He urged th a t New Jersey producers carefully consider provisions of the code and make certain that their operations do comply. P. W. Pdfmcr, Browntown, W is., proved to bo another picture fan 135 Chorfes 6. Rimkle, Zonesvitle, Ohio, left, ond T. C. M o tth e w s , L ew istow n, P e n n ., lis te n clo se ly ot the m eeting Mr. ond M rs. R. S. Lebotd, Rockwood, M ich. M r. o n d Mrs. W. H. W oodw ard, O tta w a, III. Junius M. Strouss, M orgontow n, W . V a., g e ttin g set to slam th e boil o mile 136 He briefly discussed Senate Bills Nos. 196 and 306 which had been introduced to amend the New Jersey W orkm en's Compensation Act. The present New Jersey Occupational Disease A ct requires th a t an employe give notice to an employer of con traction of a compensable disease within five m onths a fte r th e date of his la st exposure and th a t he file claim within one year afte r term ina tion of his exposure. Senate Bill 306 would have changed the law to give notice w ithin 90 days and perm it an employe to file claim w ithin one year after he knew or ought to have known th at he had contracted an occupa tional disease. It would have destroyed the defense of lim itations in occupa tional disease cases because it would have been impossible for an employer to prove when an employe knew or ought to have known he had contract ed the disease. Mr. W aters w as pleased to report th a t efforts were successful in having the present hill pertaining to compensation for silicosis retained and th a t S en ate Bill No. 306 as passed provides exemption for silicosis and asbestosis in its coverage. He believes the bill will be vetoed by the Governor. Senate Bill No. 196 has passed the Senate but has not yet been considered by the House of Representatives. It would provide general coverage for all occupational diseases and would have made pneumonoconeoses com pensable. M r. W aters believes th a t labor representatives will continue efforts to secure liberalization of com pensation statutes particularly as to provisions applicable to lim itations and disability from dust diseases. The year 1948 h as been an off year for meetings of State legislatures, he said, but the New York State Legis lature has amended the statute appli cable to com pensation for dust diseas es, reta in in g th e provision denying compensation for p artial disability but elim inating the limitation of m onetary liability which was a p rin cipal feature. The statute had an escalator clause covering compensa tion. Compensations now payable for perm anent total disability from dust diseases is the same as for any other diseases or injury. This p attern, he believes, will be followed in other industrial S tates in coming legislative sessions, which indicates higher costs of insurance rates. The New York State D epartm ent of Labor has sponsored a program of research in an attem pt to develop a method of evaluation of p artial dis ability from dust diseases, which so fa r has defied th e medical profession. Mr. W aters believes th e W est V irginia statute covering partial disability pro vides the fairest method. It provides limited m onetary benefits for partial disability, which releases the employe]' from any fu tu re claims for disability. In conclusion, he said th a t all S tates but Kentucky, Louisiana, Mississippi and V irginia will be in legislative session in 1949, and th a t labor will ( C o nj i n u ed oti page J6 P J ROCK PRODUCTS, D e c e m b e r, 1948 A . W orsaw , C hicago, III., seem s to b e pushing a point here Junius M. Strouss, M orgontown, W. Va., left, on d Jesse T. M orie, M ouricetow n, N. J-, seem ed in friendly mood before golf gam e Junius M. Strouss, M organtown, W. Va , points th e woy to golf enemy Jesse T. Morie, M ourice town, N. J. tfen ry Roeser, Jr., M illville, N. J., seem s to disagree w ith T. F, H otchs' scoring ruled th a t while the employes supply ing the highway and railway jobs were covered by the Act, the employes supplying stone for the dike were not. The Circuit Court of Appeals now said they were, again by a 2 to 1 decision, the one judge who was doubt ful in the first case, having decided the opposite way in the second. In both instances the U. S. Suprem e C ourt was asked to review the Appeals C o u rt decision, in the first by the F.L.S.A. adm inistrator and the em ployes, and in the second by the employer. The high court denied re view in both instances, so both deci sions now stand, much to the adversity of the employer and the confusion of the industry. Under the same kind of reasoning the F.L.S.A. adm inis tra to r contends th a t employes of producers of agricultural limestone come under the law' if the farm crops raised on the land th a t is limed w ith th e ir m aterial subsequently move in interstate commerce. A pparently no such case has yet reached the courts. It seems likely th a t the coverage of the wage and hour law will be extended both by the courts and by the Congress rather than narrowed. This is im portant especially if the m inim um W'age is increased to 75c per hour. The two year statute of lim itations applies to many cases, perhaps, but probably no employer is en tirely safe if he is not operating in com pliance wdth this law'. industrial Sand M eeting (Continued from page 136) be seeking greater benefits and liber alization of compensation laws. Industrial Hygiene Theodore F. Hatch, Industrial Hy giene Foundation, discussed develop m en ts in th e field of industrial hygiene, covering particularly the present status of treatm ent and re search work in silicosis, and codes. In discussing treatm ent for dust diseases, he commented on work presently being conducted at Jefferson Medical School, Philadelphia, Penn., under sponsorship of the Health and W elfare Fund of the United Mine W orkers which encompasses medical care for disabled anthracite miners, th e train in g of physicians for work in anthracite mining regions and re search. In recognition of the fact th at silicosis of itself does not cause death o r disability, b u t does so only with accompanying infection, inhalation th erap y is under study whereby medi cation is inhaled to destroy infections. In the process, a drug is adm inistered which dilates the air passages, more th a n doubling iung volume, in order th a t medication m ay reach all the way to affected areas. As an adjunct, a face m ask developed during the w ar is used w hereby pressure breathing is employed in the therapy. T husfar, no satisfactory method has been developed to m easure degree of improvement under treatm ent. The a t W a p a k 's n e w Sand and Gravel Plant A new O hio plant . . . a new Eagle Long W eir Screw W ash er - Classifier - Dehy<lrator. T he W apak Sand and Gravel Plant selected an Eagle for thorough c le a n in g exact classification,, and m axim um dewatering of sand. M aterial excavated by Boom D ra g lin e is conveyed to a scalp ing screen which shunts over size to a crusher for reduction fo r re-entering system. A ll m a terial is th e n conveyed to a b a r rel type scrubber, shown at start o f flow c h art. It then goes to a 3-deck vibrating screen which produces three sizes of gravel. All fines (m inus 1a" ) passing lower deck are flumed to the Eagle. H ere the tum bling ac tion of the Eagle screw loosens and scrubs the m aterial while the constant rising current of water floats out all trash. T he final dew atering stage is so e f fective th at this p lan t uses a 19 pitch conveyor to stack. Fines can be rejected to any desired classification by altering volum e of water and by controlling head and velocity of overflow with adjustable W eir lips. Send for Catalog 47. Sand and Gravel Equipment SW INTEK" DREDGE L A D D E R S ---- SC R E W W ASHERS LOG W A S H E R S -----D E H Y D R A T O R S------S A N D TANKS CLASSIFIERS -- REVOLVING SCREENS E A G L E IR O A I O I I l U I v v I l l l / O.TVI W ORKS Iowa ROCK PRODUCTS, December, 1948 169 ROBINSON AiA.-Aclocded C O N V E Y O R From C rusher to Storage, fr o m Storage to Car . . . it's here that th e R obinson AirActivated Conveyor will save you m oney in handling. Why? U ; o s t for conveying mate* rial from plant to car or track w eald be aimfUr. 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The real question involved is proof th at there was agreed-upon uniform ity of practices. In m ultiple basing point pricing, the question becomes one of whether or not there is violation of the Robinson-Patm an Act, which prohibits charging a higher price to one cus tom er than another where competition is thereby injured. The F.T.C. has said th a t net realized a t the factory is the governing factor when the product is sold on a delivered price basis, which m eans th a t a customer located n earer to a plant than another should get a lower price. The trouble is th at many vague interpretations are being given, such as th a t it is probably all right to quote discrim inatory prices to meet competition in some cases but only if done now or then, or th at the probability th a t a pricing system may have been injurious between com petitors is sufficient evidence to cause a cease and desist order to become effective, etc., etc. Whenever companies are engaged in delivered price selling, in order not to end up with matched prices, it ap parently would be necessary in order to be safe for the seller to be in different to whom he sells and fo r the buyer to be indifferent from whom he buys, as Mr. A ustern appropriately expressed it. As fa r as the cement case is concerned, he said th a t only one thing w as decided and th a t was th a t there had been conspiracy ac cording to th e Coui't. In discussing penalties, he cautioned th a t treble damages and criminal liability m ay be imposed in cases of conspiracy or price discrimination. Both buyer and seller are guilty where the Robinson-Patman Act has been violated. In conclusion he said th at the industrial sand industry is in the clear because its products are priced f.o.b. p la n t plus fre ig h t b u t m ay be effected because of the impact on its custom ers. R eg istratio n Mr and Mrs. V. P. /shenrn. National Industrial Sand Association, Washington, D. C. M/. and Mrs, James B. Bergs, Pioneer Silica Products Co., St. Louis, Mo Mr and Mrs. E. J. Campbell, Sun Sand Co., Thayer, W. Va. Mr. and Mrs. Harte Campbell, Sun Sand C o . Thayer, W . Va. Mr. and Mrs. W . J. Cannon, The Nugent Sana Co , Muskegon, Mich. , Mr. and Mrs. Robert R. Coxey, Industrial Silica Corp., Youngstown, Ohio .... Mr. and Mrs. J. S. Coxey, Jr., Industrial Silica Corp., Youogstown, Ohio Mr. and Mrs. Russell Cronenwetb, Great lakes Foundry Sand Co., Deuoit, Mich Mr. and Mrs E M. Durstine. Keener Saod & Clay Co., Columbus, Ohio Mr aod Mrs. Sterling Farmer, Sand Products Corp.. Cleveland. Ohio Mr and Mrs. A . Y. Gregory, Whitehead Brothers Co , New York, N. Y Mr and Mrs- C. M. Hardy, HougJand and Hardy, Evansville, lod. Mr. and Mrs. R. S. Leboid, Michigan Silica Co.. Rockwood, Mich. Mr. and Mrs. Carrer H. Manny, Producers Core Sand Corp., Michigan City, Jnd. T C Matthew; Pennsylvania Glass Sand C orp . Le-wistuwn Penn John H . M iller, Miffim Sand Go , Lewistown, Penn. M r. and M rs. Jesse T. M orie Jesse S. Mo re & Son M auricetow n, N J M r and Mr. R W M uhiitner. G reat Lakes Foundry Co., D etroit M ich. Mr and M rs W m PaddSson, G reat Lakes Foundry Sand Co , D etroit. M ich. M r. a n d Mrs P. W . Palm er Brow ntow n Silica Co . Browntown W is M r. and M rs Forrest S Pearson Standard Sand Co G rand Haven M ich M r and Mrs Joel G Pearson Standard Sand Co.. G rand Haven M ich. George F Pettinos J r , Cape May Sand & Gravel Co and G eorge F. Pettinos Inc Philadelphia. Pern. M r. and Airs John F Putnam N ational Silica Co O regon ill M r. and Mrs H enry Roeser Jr N ew Jersey Silica Sand Co and N ational Pulverizing Co , M illville N . J. Fraoh T Rogers T he N ational Silica Co . O regon, ill M r and Mrs Charles G. Runkle Ayers M ineral Co Zanesville Ohio M r an d Airs E C. Sawyer Ayers M ineral Co.. Zanesville. O hio Air and Airs A B S chlesm eer, N e w Jersey P u h erzin g Co. N ew York N Y Air. and Airs. Junius M Strouss Deckers Creek Sand Co.. M organtown, W . Va Air an d Airs A rnold H T anzer, N ew Jersey Pulverizing Co New York N Y Mr and M rs. G eorge A T hornton O ttawa Silica Co Otrawa Jii Air and Mrs H enry C T h o rn to n . O ttawa Silica Co O tta w a J1. Stanton W alker, N ational Industrial Sand Asso ciation W ashington D. C M r an d Airs A . W arsaw W e d ro n Silica Co . Chicago, HI. M r and Mrs C R W o lf Nation?! Pulverizing Oc and N ew Jersey Silica Sand Co Alillville. N J M r and Airs W H W oodw ard O ttaw a Silica Co . O ttaw a III M r an d Mr M arcus S W rig h t J r . Sourh K '\ c r Sand Co , O ld B ridge NT J G uests M r and Mr T hom as A ustero. W ashington. D C W m Al. A very P it a n d Q u a r r y C hicago, HI \T n W . Collins. J r Pim bureh Penn C kvron D evine, Silica Sand Traffic Ass n. of III . C h icag o III T F H atch Industrial Hygiene Foundation of Am erica. Inc Pittsburgh Penn. Bror N o rd b erc, R o c k P ro d ucts Chicago, JII, A M R ibe H ardy Sand Co.. Birm ingham , Ala. M r and Airs T . C W aters. Counsel Baltim ore. Md Sym posium on M ineral A ggregates American7 Society for Testing Materials, P hiladelphia. Penn., a n nounces its " Symposium on M ineral A g g re g ates.'' including i5 extensive papers, which were presented at the 1948 A.S.T.M. Annual Meeting in D etroit, Mich., and a r e grouped into six genera] categories including: dis tribution, processing and sampling; tests and mineralgica! characteris tics; aggregates for portland cement concrete; aggregates for bituminous construction; aggregates for miscel laneous use; and needed research. The symposium was sponsored by Com m ittee C-9 on Concrete and Concrete A ggregates and Committee D-4 on Road and Paving M aterials, with the following committee in charge: K. B. Woods, Purdue University, chairm an; B. A. A nderton, Allied Chemical and Dye Corp.; E. W. Bauman, National S lag A ssn.; R. F . B lanks, U. S. Bureau of Reclamation; Shreve Clark, V irginia D epartm ent of Highways; R. W. Crum , N ational Research Coun cil; A. T. Goldbeck, N ational Crushed Stone Association; Fred Hubbard, T he S ta n d a rd S lag Co.; D. E. P a r sons, N ational Bureau of Standards; and Stanton W alker, National Sand and Gravel Association. a thousand and o n e^ Macwhyte Distributors and Mill Depots -- carry stocks for immediate delivery. Macwhyte represent atives will recommend the correct rope for your equipment. Catalog on request. MACWHYTE COMPANY 2 9 4 9 Fourteenth Avenue, Kenosha, Wisconsin M anufacturers o f Internally Lubricated W ire Rope, Braided W ire Rope Slings, Aircraft Cables and Assemblies. Mill Depots: New York Pittsburgh Chicago Minneapolis Fort Worth Portland Seattle San Francisco Los Angeles Distributors throughout U. S. A . and other countries. NO. 932 STEEL S-EG -M -E-N T-A-L KILN ENDS Easier to Install . . . Longer Service Life 4 About 165 million barrels of cement--over 76% of th e annual output--is produced in plants using either or both of our alloys, PYRASTEEL and EVANSTBEL. PYRASTEEL is equally effective and economical in other high-heat applications, such as conveyor screws, feed pipes, clinker coolers, drag chains, and cement cooling equipment. You can't beat this perform ance of PYRASTEEL Kiln Ends for avoiding burnouts and shutdowns, and insuring continuous production with low cost m aintenance. In the past 20 years over 1000 PYRASTEEL Kiln Ends have been installed. Some have lasted for 14 years w ithout a failure--6 to 8 years' service is quite common. Unit Segments are easy to install or replace. Write /or PYRASTEEL Bulletin C h ic a g o S t e e l F o u n d r y PYRASTEEI Fir ht'^h tem peratures KEOZi E AVE & 3 7 ; r ST. CHICAGO 32, ILL. Makar c f Alloy St at i for 3$ f a a ' C o m pa n y ftNSli tar s t r e t t i il ROCK PRODUCTS, Decem ber, 1948 173