Coal Age : devoted to the operating, technical and business problems of the coal-mining industry, Vol. 52, No. 3

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(1):. 'iS I J à .T iiïï. HUMAN RELATIONS # W<. V*. I"-*.: •*..i. •■. .'. •.

(2) S U N M IN E L U B R IC A N T ... L asts 7 T im e s L o n g e r T h a n F o rm e r G r e a s e , In c r e a s e s T o n n a g e L o a d e d A Pennsylvania mine had this experience on its loading-machines. Greases were separating. Two or three times a week, the transmission-cases and gathering-heads had to be completely cleaned and re-greased. Tonnage loaded, per machine, went up, however, when they called in a Sun Engineer. He recommended a Sun grease, especially manufac tured to withstand the particular conditions in that mine. Loaders now operate weeks at a time, instead of shutting down every day or so. Higher production and lower maintenance-costs have been the inevitable result. Mitte after mine, where Sun's special mine-lubricants are used, knows the advantages of continuous production, and of holding maintenancecosts down to a minimum. You can put these lubricants, an d the specialized experience of Sun men to work for you today. Call the Sun office near you. Or write . . . SUN. O IL. COM PANY. .. Philadelphia 3 r Pa.. S ponsors o f f9v$ Sunoco N ew s - V o ic e o f iho A ir — L o w e ll Thomas.

(3) F ish zip th ro u gh hose — a ton a m inute A typical example of B. F. Goodrich improvement in rubber spend days gettin g a cargo— only to dam age and lose as m uch as a tw elfth o f their fish, shovel ing them from boat to cannery dock. And it takes hours— w hile fish aren’t g ettin g any fresher.. F. is h e r m e n. A N ew E ngland canner, w ho had seen oil tankers unloaded by B. F. G oodrich hose, came to B. F. G oodrich w ith the idea that fish m ig h t be u n loaded the same way. B. F. G oodrich studied the problem and th en recom m ended a certain kind of hose w ith a very soft rubber lining COAL A G E. •. M arch . 1947. so th a t fish w ouldn’t be bruised as they had been by the hand m ethod of shoveling. A m ethod was w orked out by w hich fish and w ater w ere sucked t h r o u g h t h e h o s e , so th e w a t e r "floated” the fish smoothly. T he new system w orked perfectly. Instead of hours by the old m ethod, the B. F. G oodrich hose unloads a 65-ton cargo in m inutes— food is saved, fish reach the cannery fresher, boats get back to th e fishing grounds sooner. I t has m ade such savings th a t scores of other fish com panies are investigat ing, and w ant to adopt it.. T ran sp o rtin g m aterials of all sorts at low er cost is only one of the many contributions B. F. G oodrich research has m ade to A m erican industry. Before you’re satisfied w ith any p roduct or process, it pays to find o u t w h at de velopm ents B. F. G oodrich has been m aking recently. T o find out, call your B. F. G oodrich d istrib u to r or w rite T h e B.F. G o o d ric h C o m p a n y , I n d u s tr ia l Products D ivision, A kro n , Ohio.. B E Goodrich FIRST. IN. RUBBER.

(4) .. it mord of F. i. r. s. t. i. n. i. t. s. F. i. e. l. d. .. .. .. . lim. r. im. IT WASHED CLOTHES. . . also cooked soup! Research seems to indicate that that great A m erican hom e institution —the W ashing Machine —like Topsy, "just growed." Hun dreds of different p a te n ts w ere g ran ted . Above is one of its earliest versions, produced about Ï850; and the maker claimed that the boiler, when not furnishing hot water for washing, could be used to cook soup stock for the family!. HULBURT. OIL. &. GREASE. SfrecctU ùttà. The growth of the use of HULBURT QUAL ITY GREASE is based in the fact that it fills a need of coal mine operators —the proper lubrication of coal mining machinery. A spe-"~" cihc QUALITY product for a specific use . . . your lubrication difficulties are "all washed up" when you use HULBURT down-in-themine lubrication Engineering Service and HULBURT QUALITY GREASE.. C O M PAN Y. ck. . . PHILADELPHIA,. @t*cU '/ïtù tc. PÉNNA.. THE “ F I RS T N A M E ” IN. n. L. e. a. d. e. r. s. h. ip.

(5) H a z a p re n e C a b le s m e e t th is n e w flam er e s is ta n c e te s t o f P e n n a . D e p t, o f M in e s w h ic h in c lu d e s a p p lic a tio n o f flam e f o r o n e m in u te a f te r th e c a b le h a s b e e n o v e rlo a d e d 4 0 0 % a n d s h e a th te m p e r a tu r e h a s re a c h e d 350 d e g re e s F.. M eeting the new rigid requirements for fire-resistant trailing cables established by the Penna. D ept, of Mines is no problem at Hazard. For several years, all H azard trailing cables have been built with a H azaprene jacket made with neoprene to give them high flameresistance as well as other im portant qualities. This H azard jacket fully meets the new requirem ents of Pennsylvania and now carries the official approval symbol P-104. And w ith H azaprene cable, you can also count on getting all the other life-extending properties you w ant w ith trailing cables. You get a tough jacket th at’s pressure-cured in a continuous metal mold for maximum density, extra surface smoothness, good all-around ♦ H azaprene Flam e-Re sistant Twin-Parallel Min ing Machine Cable. Penna. Dept, of Mines Approval P -104.. resistance to mechanical damage. You get a sheath resistant to oil, acids, chemicals, grease and water. Hazard Insulated W ire W orks, Division of The O konite Company, W ilkes-Barre, Pa..

(6) CONTENTS MARCH, 1947. V olum e 52. N um ber. 3. A lfre d M. S ta e h le , P u b lish e r. Human Relations: Key Factor in Coal-Mine Supervision............ 56. IVA N A . GIV EN , Editor J. H. E d w a rd s W . H. M c N eal. R. R. R ich a rl W . A . S ta n b u ry Jr.. Drilling Cost Cut by Mounted Unit With Hydraulic Controls.. . . 61. F. A . Zim m erli D o n ald D. H o g a te , W a s h in g to n H.. Anthracite Moves to Increase Colliery Productivity................. 65. R. M a th ia s , S a les M anager. Scraper Stripping Provides Flexibility With High Tonnage. W o rld N e w s offices: L ondon, P a ris, B erlin, M o sco w , P ra g u e , S h a n g h a i, B o m b ay . M exico C ity.. 69. Coal Screening and Dewatering With Vibrating Units.............. 73 By I. E. DUNN. *M cG «A W 41IU ^S. jL P U B L I C A T I O N. COAL AGE {w ith w h ich is consolidated “The Colliery E n gin eer” and “Mines and M inerals”) is published m onthly on the 1st. A llow at lea st ten d ays ior ch an ce of address. Subscription ra tes: U nited States and p o ssessio n s, $5 for one year. $8 for two years, $10 for three years. Canada, $6 for one year, $10 for tw o years, $12 for three years. Pan Am erican coun tries, $0 for one year, $10 for tw o years. $12 for three years. A ll other countries, $15 for one year, $30 for three years. S in g le copies, 50 cents each. Entered as second class m atter Oct. 14, 1930, at the P o st Office at A lbany, N. Y., under the Act of March 3, 1S79. P rin ted in the U. S. A. Cable A d d ress: “McGrawH ill N. Y.” Member A .B .P . Member A.B.C. P lea se indicate p osition and com pany connection on all subscription orders.. 76. Portal Relocation Paces New Improvements at H ubbard. 79. Atomic Power: Will It Compete With Power From C oal?. 85. By EUGENE SNYDER. Rock Dump Features Efficiency and Safety............................... 94 Small Trip Hammer Applies Cable S plicers.. f Ph.. .. 96. Welded Brace Helps Support Fender.............. Gaskets Are Best Racked on W all................ Return P o sta g e Guaranteed C ontents C opyright 1947 by M cG raw-H ill P u b lish in g Co., Inc.: all rig h ts reserved JAM ES H. McGRAW F ounder and H onorary Chairman .TAMES H. McGRAW, JR . P resid en t CURTIS W . McGRAW Senior V ice P resid en t and Treasurer JO SE P H A. GERARDI Secretary NELSO N BOND D irector of A d vertisin g EUGENE D U F F IE L D E ditorial A ssista n t to the P resid en t J. E. BLACK BURN, JR. D irector of Circulation P ub lication office, 99-129 North B road w ay, A lb an y 1, N. Y. E d itorial and execu tive offices, 330 W. 42d St., N ew York 18, N. Y. Branch offices: 520 North M ichigan Ave., Chicago 11; 68 P o st St., San F rancisco. 4; Aldw veh House, A ldw ych, London, W.C. 2; W ash in gton , 4: P hilad elp h ia, 3; Cleveland, 15: D etroit, 26; St. L ouis, 1; B oston, 16: Atlanta, 3; Los A ngeles, 14; 738-9 Oliver Bldg., P ittsb u rg h , 22. All com m unications ab ou t sub scrip tion s should be addressed to the D irector of C irculation, Coal Age, 99-129 North Broadw ay, A lbany 1, N. Y.. or 330 W est 42d St., N ew York 18, N. Y. D istrict M anagers: T. E. Alcorn and F. W . R oets, N ew Y ork; W. A. Potter, P h ila d e lp h ia ; W. M. Spears, C leve lan d ; W . S. Drake, P ittsb u rg h ; C. J. Coash. Chicago.. Productivity Lifted by Shuttle Cars, New Mining M ethod. . 98 atje. J. . 98. Outside Spot Lamp Makes Locomotive Headlight. .100. Drive Replacement Improves Yard Sw itcher.. . .. .100. Wearing Strips Extend Life of Drag Chains......... .100. Editorials ............................................................................................. 55 Foremen's F o ru m ................. 90 News Round-Up ................... 105. C H A N G E i. Coal Men on the Job. 102. Equipment News .................144. O F. A D D R E 5 S. D irector of C ircu latio n , COAL AGE 330 W e s t 4 2 n d Si., N e w Y ork 18, N . Y. P le a s e c h a n g e th e a d d r e s s ol m y COAL A G E su b sc rip tio n a s follow s:. •. N nm p. .................................................................................................................................................................. ... i. O ld A d d r e s s ...................................................................... ]. N e w A d d re s s .................................................................... j. N ew C o m p a n y C o nnection. ;. N e w T itle o r P osition .................................................... ...................................... !.

(7) th a t’s w h e re W h itn ey U n iv ersa l M in in g su p erio rity by o u t-p e rfo rm in g , o u t-la stin g. W h e r e t h e g o h / g is tough,. C hain p ro v es its ord in ary ch a in .. For lik e all W h itn ey C h ain s, th ey ’re e sp e c ia lly m ade to g iv e lo n g la stin g serv ice in lo a d ers no m atter w h at th e w o r k in g c o n d itio n s . A ll parts are m ade o f a llo y stee l, h eat-treated for ex trem e to u g h n ess and durability. T h e u n iv ersa l jo in ts are m ade o f a llo y steel fo r g in g s , accurately m a ch in ed . F lig h t stud s are fully m a ch in ed and have m ille d thread s. End p in s are fully riv eted in to d eep c o u n te r-sin k in th e fo r g in g to p ro v id e m axim u m a n ch o ra g e. K e e p your eq u ip m en t up-at-the-face p r o d u c in g . . . eq u ip your lo a d e r s w ith W h itn ey U n iv ersa l M in in g C hains. T h ey w ill g iv e to p p erfo rm a n ce and save you m o n ey w ith th eir lo n g o p e r a tin g life. S ee th e W h itn ey D istrib u to r se r v in g you r territory o r w rite:. The WHITNEY Chain & Mfg. Co. Your Assurance o f Proven Po w e r Transmission and Conveying Since 1896. HARTFORD 6. 2,. CONNECTICUT M a rc h , 1947. •. COA L A G E.

(8) V f M i i ' i i R p. C iw f |f il® ; G A i. ',- : © ? ¡jkj&wt&r .'jCiMEfr. :. JJ. F. m. m. *-/ W r f l i Mil#iy-L€f 'Sftp#(iOWlf:;''fftt"::PprtS'^:iiÎOfi*llfl®ii#^:. '■■;. ~'i. I f you’ve ever tried to dry washed fines by any other m ethod you’ll find the above statem ent hard to. b e l ie v e. — but it’s true, as has been fully. dem onstrated in the field. Ask us to prove it. ^ 7 rite B ird Alachine Co., South Walpole, Alass.. CO A L A G E. •. M a rch . 1947.

(9) B. . Two Kinds of Equipment Costs ï ?. O N S I D E R N O T O N L Y " H o w m u ch w ill. m en t. Job records offer in n u m era b le in stan ces o f. it c o s t? ” b u t a lso “H o w m u ch w i l l it co st. A llis-C h a lm e rs e q u ip m en t lo w e r in g co a l prep ar. w h e n y o u p la n a h ead in coal.. a tio n co sts . . . p r o v id in g le ss tro u b le so m e m a in . C h a n ces are y o u ’l l fin d th a t " g e ttin g b y ” w ith. ten a n ce . . . sta y in g o n th e job lo n g e r d esp ite. C. ifw e. d o n ’t b u y it?”. h a lf-w o r n. o r o b so le te eq u ip m en t w ill p ro v e. T h a t’s w h y — in term s o f o p e r a tin g efficiency,. b u ild in g p ro cessin g eq u ip m en t in a m a x im u m. m a in t e n a n c e c o s t s a n d p a y -o ff tim e —. ra n g e o f types an d sizes.. n ew. T h is is p articu arly tru e w h e n y o u sp e c ify A llis-C h a lm e r s c o a l p ro ce ssin g an d p o w e r equip-. AUXILIARY EQUIPMENT. DISTRIBUTION THESE THREE ALLIS-CHALMERS TRANSFORMERS are designed to meet exacting requirements fo r m ining service. . . step down voltages to 2,400 and 430 volts fo r primary and secondary power requirements. Aliis-Chalm ers builds a ll types of distribution and power transfor mers fo r a n y requirement -— indoor or outdoor installations — o il or Chlorexto! non-inflammable liqu id filled . . . designed in accord ance w ith A S A and N E M A standards. Fin d out about design and construction features. Send fo r BULLETIN B6168.. --_ — ------. 2. — ,----------- ------- ■ --------. •. CO A L A G E. P la n n o w to stre n g th e n y o u r p o sitio n f o r to m o rro w ’s co m p etitio n . C o n ta ct th e A -C office n ear you.. A llis - C h a lm e r s ,. 1, W is .. M ilw a u k e e. BASIC PROCESSING WIDE APPLICATION RANGE o f the Low-Head V ibrating Screen is the result o f two distinct types o f screen decks. Th e End-Tensioned Deck, shown above, is used for sludge dewatering and fine screening down to 35 mesh. Conveying action o f screen in combination w ith deck construction results in increased wet screening and dewatering efficiency. The conventional side tensioned deck is used fo r screen ing and dewatering larger size coal. Low -Head sizes range from 3 by 6 to 6 by 16 ft. Send fo r BUUETIN B6330. .. f. — --------------------------------______----- *_______ _____. M a rch , 1947. e x p er ie n c e in. CENTRIFUGAL PUMPS. 0ne oi the Bsg 3 in Electric Power Equipment — Biggest of All in Range of Industrial Products _. unexcelled. COMPACT SS-UNIT PUMPS, two 300 and one 600 gpm, used in con nection w ith air purification in coal mine. These versatile AllisChalmers pumps handle either mine water or preparation plant water . . . internal parts are made o f corrosion-resistant materials. Both motor and pump are one unit. Available w ith standard, enclosed fan-cooled, splash-proof, or explosion-proof Allis-Chalm ers squirrel-cage motors. Capacities 10 to 2,500 gpm; heads to 575 f t Two-stage pumps fo r high head pumping. BULLETIN B6Q59C.. AIIIS'CHALMERS I. Such p erfo r m a n ce records are. m o re c o stly th a n e q u ip m e n t m o d e r n iz a t io n .. e q u ip m e n t is a so u n d in v estm en t.. THE AMPAC 200 WELDER is a handy, dollar-saving investment fo r miscellaneous repair work in mine or preparation plant. M a g ic arc control eliminates weaving flame at high current settings. Ampac is easily adjustable . . . automatically selects the best striking voltage at any amperage setting, w ith the simple turn o f amperage selecting wheel. A n d Ampac cuts p o w e r co sts! A ir gap flux energy is put back to w ork by means of a reactor coil. Sizes 200 and 400 amp fo r maintenance work. BULLETIN B6241B.. sev ere service.. th e resu lt o f years o f. CO A L A G E. •. M a rd i, 1947. o. r. C. O. A. L.

(10) THE BABY THAT. GREWTOBEA. Years ago, w hen w e first b egan develop ing prefabricated track, w e naturally encountered a certain amount of the eyebrow-lifting that greets every new id e a — an understandable "show me" attitude. But the id e a caught on. Mine operators soon b egan to recognize its outstanding advantages. Points like these: ★ Each Bethlehem prefabricated-track layout is d esigned individually, for an individual mine. ★ The trackwork, including all necessary components, is quickly and easily a s. sem bled at the m ine with a minimum of labor. $ ' ■ii. • I5-. ★ O nce in service, a prefabricated-track system m eans faster, safer haulage;, fewer . derailments; greatly reduced^maintenance; lower cost per ton of coal m oved. The id ea that started life a s a b ab y is now a full-fledged giant— and still growing. If you are considering expansion or re vision of your h aulage system , prefabri cated track can probably point the w a y to important savings. W hy not ask a Bethlehem man to study your workings?. BETHLEHEM STEEL COMPANY, BETHLEHEM, PA. On the Pacific Coast Bethlehem products are sold by Bethlehem Pacific Coast Steel Corporation. BETHLEHEM STEEL I. 10. M a rc h . 1947. •. COAL A G E.

(11) R oad L u k —T .M . T h e G o o d y e a r T ire & R u b b e r C o m p a n y. Its the new heavy-duty.. GOOD/YEAR w. R O A D L U G T IR E N o w a great serv ice n eed is fu lly m et b y th is m ade-to-order h u sk y . In lo g g in g , co a l and b u ild in g su p p ly d e liv e ry , con stru ctio n and sim ila r o p era tio n s, G o o d year’s n ew tire — th e R oad L u g —goes in O F F th e road , b rin gs ou t. T h a t ’s b e c a u s e i t ’s tw o -w a y t o u g h . B o d ie d w ith super-strong, h ea t-resist in g rayon cord, th e R oad L u g is lo a d ed w ith ru gged stam ina and b ru ise re sistan ce. A n d its extra -h ea v y trea d , p r o v i d i n g m a x im u m p r o t e c t i o n. th e lo a d , th e n tak es th e h a u l O N th e h ig h w a y . A n d d oes it lik e a H e rc u le s!. again st cu ttin g and sn agging, h as a lter. T ested in strip m in e s, in ru gged tim b er co u n try, o n to u g h access road s, and u n d er p u n ish in g lo a d s over th e h ig h . on h ig h w a y runs.. w a y , th is d ou b le-d u ty h a u le r proved b ru te en o u g h to stand th e gaff and g o u g in g O F F th e road , and roll up n ew m ile a g e records O N th e road. It averaged 33% lo n g er tread w ear and. fo r fu ll data on th e n ew R oad L ug th a t p ays off b ig in d o u b le-d u ty service. It w ill g iv e y o u a n ew p ea k in tire p er form a n ce, and an o th er reason w h y. 25% lo n g er tire life . COA L A G E. •. M a rc h , 1947. TOUGH RUNNING MATE FOR THE BIG BO SS Goodyear's HARD ROCK LU G -s till the world’s toughest work tire for straight, brutal, off-the-road service.. n ate lo n g and short bars so it can d ig in for traction and still la st and la st. B e tte r see you r G o o d y ea r d ea le r n ow. “more tons are hauled on Goodyear truck tires than on any other kind.”. BUY and S P E C IF Y g. o. o. d. —. / V e a r. itpays1 ..

(12) Increased Tonnage. . . Lower Costs ball and roller bearings in all types of mine m achinery last longer, ru n m ore efficiently, and require less m ain tenance w hen lubricated w ith Texaco Regal Starfak. Texaco Regal Starfak far exceeds every service requirem ent for an ideal anti-friction bearing lubricant. T he qualities th at give it this o u t standing position are outlined on the opposite page. For heavy-duty bearings, both plain and anti-friction, use Texaco M arfak. It protects under heavy loads, and under the ham m ering of rough service. U sing the rig h t lubricant rig h t helps enorm ously in m aintaining effi ciency, increasing tonnage and low ering costs. Texaco Lubrication Engi neering Service w ill gladly w ork w ith you to this end. Simply call the nearest of the m ore than 2300 Texaco distributing plants in the 48 States, or w rite T he Texas Company, N ational Sales D ivision, Dept. C., 135 East G. r e a s e -lu b r ic a t e d. 42nd Street, N ew Y ork 17, N . Y.. STANDS UP under high Gives greater protection promotes easier starting.. TEX A CO M AINTENANCE LUBRICATION CHARTS: Leading manufacturers of under. ind low temperatures,. ground coal mining machinery approve Texaco products for use on cutters, loaders, locomotives, etc., and have cooperated in preparing these charts. Charts show clearly where and when to use the proper Texaco lubricant. Order the charts you need by make and model of each machine.. against hot bearinas. Tune in . . . TEXACO STAR THEATRE every Sunday night. See newspaper for time and station.. 12. M arch , 1947. •. CO A L A G E. COAL A G E. •. M a rch , 1947. 13.

(13) Coal M ining Is Big Business -.. W. ycuittq- it (fetten exfcÙHtivee ¿d aun êuitnedd. A p p roxim ately 620,000,000 ton s o f b itu m in ou s and 6 0 ,0 0 0 ,0 0 0 ton s o f an th racite — th a t’s th e stu p en d ou s am ou n t o f coal produced in A m erica a n n u ally. W ith o u t such prod uction , in du strial life as w e k now it w ould be im p o ssib le— m odern com forts w ould be u n attain ab le. L a st year b itu m in ou s op erators alone accoun ted for 47 p ercent o f th e pow er used in th is co u n try, 52 p ercent o f our electrical energy. R ailroads b ough t m ore th an one sixth th e b itu m in ou s o u tp u t; factories utilized ap p roxim ately as m uch. In ad d ition , a n th racite fields supplied d o m estic fuel and p ow er— k ep t m illions o f A m erican h om es warm and com fortable. A n in d u stry so v ita l to m odern eco n o m y is n a tu ra lly d ep en d en t upon m odern tools. T h a t ’s w here A tla s exp lo siv es com e in. A tla s an n u ally su p p lies m illions o f pounds o f exp lo siv es to the coal in du stry. Its poundage con trib u tion is a m ajor on e, b u t the quality o f th e exp losives is im p ortan t also. L ikew ise b lasting m eth o d s are im p o rta n t— m ig h ty im p o rta n t— and A tla s has m ad e n otab le co n trib u tio n s to low ered co sts and greater sa fety in coal m ining.. Coal is a keystone o f American industry, and Atlas is proud o f the part it plays in sustaining its importance, increasing its effectiveness.. A TLA S. E X P L O S IV E S ! ' E M ? “ Everything for Blasting”. A TLAS P O W D E R C O M P A N Y , W ilm in g to n 9 9 , D el.» O ffices in p r in c ip a l cities • C a b le A d d r e s s —A tpow co ¡a m m sm m. s s i s i i i ' s i s 14. M a rch , 1947. •. COA L A G E.

(14) C O A L-H A N D LIN G -. A l l through the cycle, from pro duction to consum ption of coal, “Caterpillar D iesel equipm ent can do m any things. Its versatility keeps it profitably occupied. F or the m ine operator, it has no superior for stripping overburden, ripping, loading and hauling, cleaning up around shovel, building and m aintaining haul roads. F or either m ine operator or industrial user, it is just the thing for stock-m oving and piling. Illustrations: C lam -shells get the coal off the cars. A “C aterpillar” D iese l M otor Grader m oves it off the “ s h e lf” into w indrow s. “C aterpillar” D iese l w heel-type T ractors and S c r a p e r s h e a d th e h a u l i n g c a r a v a n . A “C aterpillar” D iese l track-type T ractor adds “push” in loading the scraper. It also pulls a ’ tamper, to com pact the stock-pile and insure against spontaneous com bustion and leeching. D eepening, leveling or extending yard ; building and m aintaining roadways are fur ther u ses for this versatile, m oney-earning equipm ent. F o r the jobs or chores y o u have, get som e cost figures from your “C aterpillar” dealer. Y ou can’t lose !. E N G IN E S • T R A CT O R S MOTOR. GRADERS. EA R T H M O V IN G. E Q U IP M E N T. C A T E R P IL L A R T R A C T O R C O .. P E O R IA , IL L IN O IS COA L A G E. •. M a rc h . 1947. 15.

(15) T IM E u. t. o. m. a. t. i. A T. 4 *. c. ■ v i. ■— m in iH ffr fflr. LOADING. - 4 - to n c a rs e q u ip p e d w ith A u to m a tic C o u p le rs m o v e u n d e r t h e lo a d in g b o o m a n d b a c k in to a d ja c e n t c h u te s q u ic k ly a n d e a s ily . A ll u n n e c e s s a r y tim e in c o u p lin g a n d u n c o u p lin g is e lim in a te d .. T o b r i n g c o a l fr o m t h e v a s t in t e r io r s o f its L e is e n r in g M in e s , t h e H . C . F r ic k C o k e C o m p a n y , s u b s id ia r y o f th e U n ite d S t a t e s S t e e l C o r p o r a t io n , u s e s m o d e m r a il h a u l a g e , a s y s t e m e m b r a c i n g m ile s u p o n m ile s o f u n d e r g r o u n d tra c k a n d m o re th a n 1 8 0 0 a ll-s te e l, e n d -d u m p c a r s . T o a d d s t i l l g r e a t e r e f f i c i e n c y to t h is s y s t e m , e a c h o f t h e 1 8 0 0 c a r s is e q u i p p e d w i t h O -B A u t o m a t ic C o u p le r s. fo r fa s te r c a r s h u n t i n g , e a s i e r h a n d l i n g a n d in c r e a s e d p e r s o n a l sa fety . A u t o m a t ic C o u p le r s c a n b r in g t h e s a m e b e n e f i t s t o y o u r h a u l a g e s y s t e m . If y o u a re c o n te m p la tin g th e p u r c h a s e o f n e w m i n e c a r s , m a k e it a p o i n t t o i n v e s t i g a t e t h e O -B A u t o m a t ic C o u p le r — t h e c o u p l e r d e s ig n e d s p e c if ic a lly to m e e t m in e o p e r a t i n g c o n d i t i o n s . W r it e t o d a y f o r e n g in e e r in g d e ta ils .. O-B AUTOMATIC COUPLERS. DUMPING. —A s th e lo a d e d c a r e n te rs th e h o ist, it b u m p s off. m a in h a u l. C a rs c o u p le a u to m a tic a lly as th e y c o m e to g e th e r —n o n e e d to g o b e tw e e n. th e e m p ty w h ic h th e n c o u p le s in to a tr ip .w ithout m a n u a l a tte n tio n .. MANSFIELD, OHIO CANADIAN. OHIO. NIAGARA. BR ASS. FALLS, O N T .. D e s ig n e d Specifically for M in e Service. t h e c a r s to m a n i p u l a t e t h e h i t c h i n g s . 16. CO. , LTD.,. M arch , 1947. •. CO A L A G E. COA L A G E. •. M arch , 1947. 17.

(16) T h e a le r t t e c h n ic i a n i n t h e i l l u s t r a t i o n is c e n s o r in g f ilm — t h e s t r e n g t h o f f ilm i n S in c la ir i n d u s t r ia l lu b r ic a n t s d e s i g n e d f o r p r o t e c t io n o f y o u r v a l u a b l e m a c h in e r y . T h e s e t e s t s p r o v e t h a t S in c la ir lu b r ic a n t s h a v e t h e f ilm s t r e n g t h t o k e e p m o v i n g m e t a l p a r ts se p a r a te d u n d e r e x tr e m e te m p e r a tu r e a n d p r e s s u r e c o n d it i o n s . W i t h t h e S A E f ilm s tr e n g th t e s t m a c h in e , s k ille d la b o r a to r y te c h n ic ia n s c h e c k c o n s ta n tly , r e je c t s u b sta n d a rd p r o d u c t, a ssu re y o u. o f e s s e n t ia l. S ta c la & t /¿ u & u u o tc v e ^ .u fa U c c u tte fr v t, S & U fr ‘T T fa U ty. For Engines:. O PA LIN E M O T O R OIL O P A L I N E TBT M O T O R O IL (For severe service). T E N O L (Heavy Duty — For Diesels). p r o t e c t io n . E v e r y b a t c h o f lu b r ic a n t i n p r o c e s s g e t s a n e q u a l l y c a r e f u l c h e c k f o r o t h e r a ll- im p o r t a n t q u a lit ie s . C o n s ta n t r e s e a r c h b y S in c la ir a s s u r e s y o u o f t h e b e n e f it s o f n e w d e v e l o p m e n t s i n f ilm s t r e n g t h . . . a n d in a l l o t h e r. For Gears:. OPALINE GEAR LUBRICANTS For Chassis:. OPALINE CH A SSIS LUBRICANT For Wheel Bearings:. SINCOLUBE. p r im e lu b r ic a n t q u a li t ie s .. S IN C L A IR R E F IN IN G C O M P A N Y • *30 FIFTH AVENUE, NEW YORK 20, N. Y.. M a rc h , 1947. •. COAL A G E.

(17) SULLIVAN DIVISION. JOY MANUFACTURING COMPANY GENERAL. OFFICES:. HENRY. W.. O LIVER. BU ILD IN G. PITTSBU RG H ,. PA.

(18) F. O R overhead traveling cranes in steel mills, for winch lines and slings, for hold ing and closing lines on grab buckets, for towing hawsers and mining machine ropes—industry after industry has conditions where high strength must be combined with great flexibility. Wherever drum or sheave diameters are small, or where reverse or acute bends are encountered, fatigue stresses are high. For this type of service Upson-Walton 6 x 37 Perfection Layrite Cable is best because the individual wires in the strand are finer; therefore they are more flex. ible and better able to resist fatigue stresses. In addition, the greater number of fine wires in the rope gives it a greater metallic area, so strength is still high. Hemp center or, where crushing conditions are ex tremely severe, IW RC (independent wire rope center). Specify Upson-Walton 6 x 37 when you need maximum flexibility plus a high degree of strength. Specify Perfection grade because this improved plow steel is the strongest and toughest and most resistant to wear of all the grades of wire used to make rope. Specify Layrite because this fine /»reformed wire rope results in longer life, greater safety and greater economy.. Upson-Walton 6 x 37 Perfection Layrite is worth specifying a nd always up to specifications! Established 1871 C o p y rig h t 1 9 4 6 — The U p so n -W a lf o n C o m p a n y. THE UPSON-WALTON COMPANY 'fftcuiccfactcczer-x <%£ Ti/Cxc l&o/ie, 7(/Ote tRofie " p ittin g , 'Jadcic S(oc6& M A IN O F F IC E S A N D FACTORY: C LEV ELA N D 13, O H IO. 114 Broad Street New York 4. 20. 737 W. Van Buren Street Chicago 7. 241 Oliver Building Pittsburgh 22. M arch , 1947. •. CO A L A GE.

(19) I. wuat Ceâcutctfan, ofienatûM ,. tM d. m. f S. M. ÂW,VVAVtA. T o k e e p J e f f r e y L o c o m o t iv e s o n t h e j o b o v e r l o n g p e r io d s w i t h a m in i m u m o f m a in t e n a n c e is t h e a im o f t h e m e n s h o w n o n t h is a s s e m b ly i4 I»î».?’.•/. /4*» % , ,. m. m. .,. rn m. lin e . T o p e r f o r m b e t te r , t h e y m u s t b e b u i l t b e t t e r . T h i s r e q u i r e s m o r e t h a n m e c h a n ic a l s k i l l a n d c a r e f u l w o r k m a n s h ip . I t r e q u i r e s y e a r s o f e x p e r ie n c e in b u i l d i n g e q u ip m e n t to J e f f r e y s ta n d a r d s o f d e s ig n a n d c o n s t r u c t io n . T h a t t h e s e m e n a r e d o i n g t h e i r j o b w e l l is e v i d e n c e d in t h e s e r v i c e r e c o r d s o f J e f f r e y L o c o m o t iv e s w h i c h h a v e b e e n o p e r a t in g f o r yea rs an d s t ill " g o in g s tr o n g ” u n d er w id e ly. >AvW W t Y« 'v. ®W. v a r y i n g c o n d it i o n s . W e a r e j u s t ly p r o u d o f t h e s e m e n a n d t h e p r o d u c ts t h e y b u il d f o r J e ffr e y ..

(20) A Jeffrey .¿-ton Gathering Locomotive gathering a trip of cars in a large coal mine. Also loco motives for m ain-line haulage; coal cutters, lo a d in g m a c h in e s, underground co n veyors, fans, blowers, tipples and tipple machinery..

(21) ♦•V.. » ♦ / / / .iV A V / é V »* »•’* *'.W . ' *Y * «♦♦*»*'•V'i» mM */<// .. m u â t ß e A o u ttd ¿on,. P B T. r.vyw-v.v.vrv/, v.'.'.'. V/-'-. J E F F R E Y S E R V I C E TO T H E C O A L M IN E S MEANS S E R V IC E TO ALL INDUSTRY LOCOMOTIVES m. i l LOADERS. CUTTERS DRILLS CONVEYORS DRILLING MACHINES ■. ». T o k e e p J e f f r e y L o c o m o t iv e s o n t h e j o b o v e r ¡fptegei.. l o n g p e r io d s w i t h a m in i m u m o f m a in t e n a n c e is t h e a im o f t h e m e n s h o w n o n t h is a s s e m b ly. BLOWERS. li n e . T o p e r f o r m b e t t e r , t h e y m u s t b e b u i l t b e t t e r . T h i s r e q u i r e s m o r e th a n m e c h a n ic a l. m. m. m. m. m. s k i l l a n d c a r e f u l w o r k m a n s h ip . I t r e q u i r e s y e a r s o f e x p e r ie n c e in b u i l d i n g e q u ip m e n t to J e f f r e y s t a n d a r d s o f d e s ig n a n d c o n s t r u c t io n . T h a t t h e s e m e n a r e d o i n g t h e i r j o b w e l l is e v i d e n c e d in th e s e r v ic e r e c o r d s o f J effrey L o c o m o t iv e s w h i c h h a v e b e e n o p e r a t in g f o r y e a r s a n d s t i l l " g o i n g s t r o n g ”, u n d e r w i d e l y. Safes Offices;. Baltim ore B irm in gh a m Boston Buffalo. Service Stations;. P ittsb u rgh H a rla n , K y.. Foreign Plant%. Jeffrey M f g . Co., Ltd. M o n tre a l. Q u e b e c. v a r y i n g c o n d it i o n s . W e a r e j u s t ly p r o u d o f t h e s e m e n a n d t h e p r o d u c t s t h e y b u ild f o r J e f f r e y .. C h ic a g o C le v e la n d C in c in n a ti D etro it. Denver H a r la n H ou ston H u n t in g t o n. B irm in gh a m St. L ou is British J e ffre y -D io m o n d . Ltd, W a k e fie ld , E n g la n d. M ilw a u k e e N e w York P h ila d e lp h ia P ittsb u rg h L o g a n -B e e k le y W . Va.. S c ra n to n St. L ou is S a lt L ake C ity Scranton Je ffre y -G a lio n (P t y ), Ltd, J o h a n n e sb u rg , 5. A ..

(22) I This truck has made 400,000 miles I without engine trouble...with. 0 2 0 P A P IN ST. ST. LOUIS. MO.. The William Klipsches, Sr. and Jr., of the William KUpsch & Son Coal Company, St. Louis, Missouri, talk over the splendid performance of their 25-ton hopper-type truck.. T h is 2 5 -ton, h o p p er b o tto m co a l truck is o n e o f 1 9. 15 0 ,0 0 0 m iles. E n g in es s h o w c o m p le te la ck o f slu d g e. trucks in th e K lip sc h and Sons C oal C o m p a n y fleet. and a lm o st n o varn ish . A n d th e sp ecia l h o p p er truck. h a u lin g co al from th e m in es.. has lo st n o tim e due to fa u lty e n g in e p erfo rm a n ce in. W h e n this truck w as p u t in to service, M r. K lip sc h. w e ll o v er 4 0 0 ,0 0 0 m ile s o f steady d a ily d riv in g .. d ecid ed to try a h ea v y duty, d eterg en t-ty p e m o to r o il.. Y ou can find o u t for y o u r se lf h o w S ta n o lu b e cuts. H e fe lt th at su ch an o il w o u ld h e lp cu t m a in ten a n ce. m a in ten a n ce co sts and d elays, just by a sk in g a S ta n d . o n h is o ld er trucks and w ard o f f tro u b le in th e n ew. ard O il E n g in eer to test it in o n e o f y o u r h a rd -w o rk in g. and v ita lly im p o r ta n t 2 5 -to n u nit. H e p ick ed Stano-. m in e trucks.. lu b e H D . J u st w rite Standard O il C o m p a n y ( I n d ia n a ) , 9 1 0 R esu lts h ave b een e x c e lle n t. In th e o ld e r trucks, d ista n ce b etw e en o v er h a u ls has b een increased to. S outh M ich ig a n A v e n u e , C h ica g o 8 0 , Illin o is, for th e E n g in eer n earest you ..

(23) O F INDUSTRY. VI0JO1. LOW TIL1TY. .TRfVlL iwvM«-. H erb ert B . M a w , G overn or o f U ta h , t e lls h is s t a t e ’s s t o r y .. RAftS. " N a tu r e w as kind to U ta h . D ep o sited w ith in her borders are rich and varied sources o f coal and iron, lead and zinc, copper, sil ver and gold. T h ese and m a n y other in d u s trial a ttrib u tes are p art and parcel o f the u n d evelop ed sectio n s o f th is sta te.. A SCENIC W O N D E R LA N D. A g ig a n tic steel in du stry w h ich can serve the w est sign als our in du strial am b ition . I t w ill form th e n ucleus o f a n etw ork o f associated in du stries. "Our need now is p eop le and leadership to share in th e p rosp erity o f a w estern em pire. Our natural resources are p ractically u n touched. T h e y assure a long life to an in d u s trial future w hich is ju s t now beginning. U ta h in v ites new and exp an d in g in d u stry to in v estig a te op p ortu n ities here before d eciding upon new lo c a tio n s.”. O n e o f a se rie s o f a d v e r tis e m e n ts ba sed o n in d u s tr ia l o p p o r tu n itie s in th e s ta te s se rv e d b y th e U n io n P acific R a ilro a d .. F o r in d u s t r ia l r e s o u r c e s a n d o p p o r t u n it ie s , lo o k t o U t a h . F o r u n e x c e lle d ra il t r a n s p o r ta t io n . . .. be Specific U nion Pacific ^. UNION. PACIFIC THE. 16. A d d re ss I n d u s tr ia l D e p a r tm e n t, U n io n P acific R a ilro a d , O m a h a 2, N e b ra sk a , f o r in fo r m a tio n re g a rd in g in d u s tr ia l s ite s .. STRATEGIC. MIDDLE. RAILROAD ROUTE M a rc h . 1347. •. CO A L A C 't.

(24) ENGINEERED TO PROVIDE MAJOR PROTECTION AGAINST. T h e C ardox M ine-F ire Car com bines in a single m obile u n it facilities for (1) d rivin g ou t sm oke and reducing th e tem p eratu re in a room or passagew ay, (2) sealing th e surface around d eep -seated coal fires w ith " C A R D O X F IR E C O A T ,” (3) q u ick ly extin gu ish in g oil and electrical fires, w ith ab solu tely no d am age b y th e extin guishing m ed ium to th e eq u ip m en t in v o lv ed , (4) " C A R D O X F IR E C O A T ” p rovid es a quick, effective m eth od for creating tem porary, rigid fireproof seals in burning areas, (5) pro v id es CO 2 for inerting tb e atm osp here to p reven t an exp losive con centration o f m eth an e gas. F u ll d etails on th e size, design and fire-fighting efficiency o f this specialized C ardox M in e-F ire Car are availab le in a b u lletin ju st off th e press. W rite for you r copy to d a y .. BELL. B U I L D I N G. •. C H I C A G O. 1,. I L L I N O I S. District Offices: New York . Philadelphia . Library, Pa. . Pittsburgh . Meadowview, Va. . Harper, W. Va. Camden-on-Gauley, W. Va.. •. Cleveland. Louisville, Col.. COA L A G E. •. M arch , 1947. .. .. Detroit. .. Evansville, Ind.. «. Benton, III. .. St. Louis. San Francisco . Los Angeles • San Diego. 27.

(25) YESTERD A Y. .• s h o u t. SHORTWALL. I n E n B i i f i :. —. M arch, 1947. •. COAL AGE. M arch. 1947.

(26) Continental. Idlers. A co m p le te line o f T ro u g h Ing, F la t Belt a n d Pick in g T a b le Idlers, Tim ken o r S K F e q u ip p e d , f o r b e lts 14 to 60 Inches w id e . A ls o a co m p le te line o f acce ssorie s, In c lu d in g Tripp ers, Pulleys, Drives, etc.. Take-ups,. W rite to r B ulletin ID-105. W hen the Belfry C oal Com pany opened a new mine in Kentucky, they were faced with the prob lem of hauling the coal across the Tug River to the C & O Railroad in W e st Virginia. M any methods were considered, but it soon became apparent to company engineers that a belt con veyor carried on a suspension bridge was the most practical solution.. uniformly fed by an apron feeder onto the 3 6 " belt conveyor— sped across the river at 200-FPM to the tipple on the opposite embankment. This is typical of the manner in which Continental engineering is assisting industry in solving their materials handling problems. M a n y industries. Continental engineers then designed the system pictured above on which run-of-mine coal is. are. taking advantage -of our. present day stocks to build com plete convey ors. S end us your orders or inquiries.. IOOA. IN D U STR IA L. DIVISION. CONTINENTAL GIN COMPANY ATLANTA. 30. •. DALLAS. MEMPHIS. M a rch , 1947. •. CO A L AG E.

(27) It fits into your locomotivesand into your haulage plans. WESTINGHOUSE HYDRAULIC BRAKES H ere’s the modern, power braking you. higher. need. average speeds through faster brake. on. your. m odem ,. high-speed. i locom otives . . . p u t up in. a. small. top. speeds,. and. im proves. application and release. Car spotting can be handled w ith greater ease and. I package. I The engineers focused on com pactness | in the design. As a result, this brake. accuracy. Overall haulage efficiency takes a definite upward step, and m aintenance from worn wheels, split. i system provides the instant response,. pinions, and motor damage due to. flexibility o f operation, and high brak-. bucking takes a definite drop, •when. } ing forces essential for safe, speedy haulage . . . y et can he tucked away into unused corners and crannies of j the locom otive. ] T he. faster, better. W estinghouse H ydraulic Brakes are installed. Ask for bulletin SP 9092 for details. Y ou can install these brakes the next. control perm its. tim e your locom otives are in the shop.. ^Vestinghouse Air Brake Co. IN D U S T R IA L D IV IS IO N I COA L A G E. •. M a rch , 1947. W IL M E R D IN G. PE N N S Y L V A N IA 31.

(28) ■. M m ,. * f. ». ». r. t Used. m. togging, Cotorictie».. tit. Mining. Here is a tire th at can go in after the load, take the load, pull out and highball on the highw ay to mill, tipple or dump. It’s designed for through track ing and straight rolling. . . a real, specially designed on and off the highway, 2 in 1 tire. You’ll find it hard to heat up, h ard to b eat up and h a rd e r to w ear out. T h a t’s th e w ay it’s designed and b u ilt. . . after years of study and m onths of testing on tough operations. See the L. C. M. at your regular General dealer and see the difference.. F re e -R o llin g High. F l o t a t i o n is a. TRUCK TIRE M a rch , 1947. •. CO A L AG E. W h e e ls factor. It takes a tire w ith high deflection to get good flotation, to stand up and roll in soft ground. The ability to s t a n d u p a n d r o l l w hen it’s sticky is built into this newly designed, thoroughly tested General. It not only rides h i g h e r , but also rolls more easily, u s e s l e s s e n e r g y from the power wheels. W atch it work and you’ll see more yards of dirt move faster. W atch it absorb o b stru ctio n s th a t w ould bruise a hard tire. And, because it’s tough,Top Quality throughout and built on G eneral’s famous shock absorber principle, it lasts longer.. GENERAL 32. m. COAL A G E. •. M o ic h , 1947.

(29) Take a WALWORTH No. 225P Bronze Valve Apart... C O M P A R E XT P I E C E B Y. It w ill pay you to look inside the W alw orth N o . 225P. Compare the im proved design, construction and convenience features shown in the "ex ploded” view. N otice the husky bronze body, the removable seat and disc, the over size stem, all assuring maximum protection against wear and leakage.. P IE C E. Further, N o . 225P is the T O U G H E ST bronze valve your m oney can buy. T h e stainless steel, noncorrosive seats and discs are heat treated to a hardness o f 500 B rinell — hard enough to scratch glass and crush nails. For this reason, the valve can be closed on sand, slag, scale and similar flotage w ithout injury to the seating surfaces, and "wire drawing” is practically eliminated. Thus years o f tigh t, positive shut-off are assured. A vailable in both globe and angle types (an gle type: N o . 227P ) in sizes Vi" to 2", this quality valve is recommended for 350 lbs. W .S.P. at 550 F, and 1000 lbs. non-shock service on cold water, oil, gas or air. For fu ll data on this long-life, economical W alw orth Bronze Valve, see your local W alw orth distributor, or write for Circular 82.. WALWORTH valves. and. fittings. 60 EAST 42nd STREET, NEW YORK 17, N . Y. DISTRIBUTORS. 34. IN P R I N C I P A L. CENTERS. THROUGHOUT. THE WORLD. Mcrreh, 1947. •. CO A L A G E.

(30) A Kennametal bit. aces before it was sharpened. T h e se a r e fig u r e s tak en from p e r fo r m a n c e d a ta c o l. e ig h t-h o u r shift to p a y for a ll th e 4 2 K e n n a m e ta l b its. le c t e d. in th e cu tte r b ar c h a in .. b y a sa tisfied. u ser of K e n n a m e ta l c u ttin g. S u c h fa cts a s th e s e h e lp to. m a c h in e b its in a W a sh in g to n C ou n ty, P e n n sy lv a n ia. e x p la in w h y m o re a n d m o re c o a l m in e s u s e K e n n a . c o a l m in e .. C o m p a r in g K e n n a m e ta l b its w ith s te e l,. m eta l b its e v e r y d a y . A n d w h y th e y m a y b e a b le to. b its c u ttin g c o a l in th e P ittsb u rg h se a m , m in e o p e r . h e lp y o u b r in g a b o u t m o re e c o n o m ic a l c o a l c u ttin g .. ators fo u n d that s t e e l b its cu t 4 p la c e s b e fo r e sh a r p e n in g ; K e n n a m e ta l, 1 7 5 . A m a r g in of 171 p la c e s. If y o u w o u ld lik e a d em o n stra tio n , o u r r e p r e s e n ta tiv e in y o u r d istric t w ill b e g la d to c o n ta c t y o u .. S im p ly. w ith K e n n a m e ta l u n d e r co n d itio n s that w e r e id e n tic a l.. w rite— M in in g D iv isio n , K e n n a m e ta l In c ., L a trob e,. A th o u sa n d p la c e s w e r e cu t b e fo r e th e b its w o re. P a., g iv in g y o u r n a m e a n d a d d r e ss. A s p ro m p t d e . out, a b o u t 1 6 ,0 0 0 to n s of c o a l m in e d . A n d th e bit. liv e r y c a n b e m a d e , w e s u g g e s t y o u w rite today!. co st fig u r e d o n ly .4 of o n e c e n t p e r ton . T h is m in e u se d th e n e w b its o n a Jeffrey 3 5 B B c u ttin g m a c h in e h a v in g a 9' bar, a n d 9 ' b y 1 2 ' p la c e s w e r e cu t at th e rate of 1 3 m in u tes p e r p la c e . W h e n s te e l w a s u se d it took 1 8 m in u tes p e r p la c e , a n d th e c u ttin g m a c h in e c o n su m e d 2 5 to 3 3 % m o r e p ow er. CO A L A G E. M o reo v er, e n o u g h tim e w a s s a v e d in a n •. M arch , 1947. NNAMETÁL SUPERIOR. CEMENTED. KENNAMETAL^«.,. CARBIDES. l a t r o b e. ,. p a. ..

(31) the Rings are the reason for Minimum Fines Uniform S iz in g and only. A M ERICANS have SHREDDER RINGS Americans exclusive manganese steel shredder rings that reduce by rapid splitting impact are the reason Americans produce minimum fines, uniform sizing and no oversize. Each shredder ring has 20 cutting edges, revolves freely on its own shaft and deflects without damage from tramp iron. The high tonnage output of Americans at slow power-saving speeds is attained by the rapid reducing action of the multiple cutting edges of the rows of rings on the rotor, as shown at left. _. The American A C Crusher shown at left directconnected to motor is designed and built for long dependable service. The entire frame is of sectional design with easy access to crushing chamber lined with standard manganese steel sections. S e n d fo r la fe sf " A C " Bulle tin. 1119 Macklind Avenue St. Louis 10, Mo.. 36. M a rch , 1947. •. COAL AGE.

(32) "S lic k e st S w in g w e e ve r k n e w ! " You'll hear owners say it again and again — wherever you find the P&H Model 1 0 5 5 on the job. And you'll find them all over the country. It's not su rp risin g that the P&H Magnetorque Swing should be such an outstanding success. For swing clutches have always been a major source of trouble.. THE P&H MAGNETORQUE SWING Electromagnetic forces transmit power for both swing and propel . . . m ag netic pull instead of mechanical friction. Electric current is supplied by a small generator on the main engine — con trolled from operator's station. Swing ing slow or fast, has cushioned acceler ation and deceleration. Swing friction maintenance is eliminated. It’s another important P&H Added Value.. ELIMINATES SW ING FRICTIONS P&H removed the cause of trouble by replacing the swing frictions with Magnetorque units, mounted in the same relative position. They transmit power for swing motions without m e chanical linkage, without friction — without wear.. starts and stops eliminate waste oper ating time—increase daily production — cut yardage costs.. NO MORE MAINTENANCE You need never lose another day — or even an hour — because of swing clutch maintenance, repair or replace ment. The P&H Magnetorque unit will last the life of the machine. Users will tell you it's one of the most im portant improvements ever made in the field of large excavators. That's why users won't b e without it . . . why they reorder. A sk for cominformation.. EXCAVATORS 4540 W. National Avenue Milwaukee. S P E E D S PRODUCTION Swing is smoother, faster, more re sponsive. Q uicker, m ore accurate. 14,. Wisconsin.

(33) '. pis» 1. .. -. 1. H R. : ■.:■ '.'. A. ■ ■ p-. ■ ■. 1. :--. u. I S * CUTTER BIT SHARPENER. S H A R P EN ER B m y f W m , . i l m m. -. *. -. p i p v ld B s te w ffs r«.^ iillo r n i .b Its. .. 1 ‘ .-.. ‘. ■ : ■ ;. ■ '. ■. '. ’. ■. 1, :'. ■. AUTOMATIC CUTTER BIT HEATER tim e-saving companion to bit sh a rp e n e r C orrect h e a tin g b e fo re sh a rp e n in g is im p o rta n t to uniform q u ality cutter bits. O n ly p oin t is he ate d -In the Su llivan H e ate r, c o n se q u e n tly sh a n k is n o t tem p ere d . G r a v it y fe e d th a t a u to m atically h e a ts bits to p ro p e r tem p eratu re .. W&D I. SULLIVAN DIVISION. JOY MANUFACTURING COMPAN GENERAL. O FFICES:. HENRY. W.. O LIVER. B U ILD IN G. PITTSBURGH,. P.

(34) s. IT M A Y N O T SEEM TO BE. Of course you wouldn’t use a wheelbarrow to move coal out of a mine. But any inefficient conveying method costs you money, it costs you time and production! Yes ... it is a luxury!. BUT WHEN ROBINS UNDERGROUND MINE CONVEYORS ARE PUT TO W O R K— They do your job cheaper. T hey’re “J ob -E n gi n eered ” to fit your production schedule . . . to carry coal faster and at low er cost per ton. They do your job faster. T hey’re on th e job all day. T hey m aintain the steady flow of coal you need to keep your m ine running efficiently. They do your job better. A Robins Underground M ine Conveyor equipped w ith H ew itt B eltin g is the resu lt of a perfect com bination—H ew itt Rub ber and Robins C onveyors— backed by 138 years of m aterials handling experience. W hy not check w ith Robins for the cheaper, faster, better w ay to m ove your coal?. ". Jo b-E ngineered " to solve y o u r problem. C H E A P E R . . . F A S TE R . . . BETTER You ore invited . . . to visit the Robins Conveyors Exhibit at the American Mining Congress Annual Coal Convention — Spaces 1533, 1539, and 1545 — Cleveland, M a y 12 through 15 R O B IN S C O N V E Y O R S D I V I S I O N , H E W IT T -R O B IN S IN C O R P O R A T E D , P A S S A I C , N EW J E R S E Y COA L A G E. •. M a rch , 1947. 39.

(35) PERMATREAT COAL. SPRAY. Gi v e s A l l T h e s e A d v a n t a g e s to I n d u s t r y. Cents Per Ton! M o r e u n ifo rm h e a t th ro u g h o u t fire b o x . H o ld s in h e re n t m o is ture to g i v e m o r e c o m p le te co m b u stio n . E asie r to r e g u la t e fo r e v e n te m p e ra tu re . C u ts cost of s t o k e r f e e d i n g .. D o e s n ’t. in tran sit. S to re s b e tte r w in d loss. Free flo w in cold w e a th e r. N o co r r o s iv e action on e q u ip m e n t.. M a rch , 1947. •. COA L A G E.

(36) E X P E R IE N C E P ro d u ce s S u cc e ssfu l D esign s CLO C's m a n y y e a r s ' e x p e r ie n c e in p r o d u c in g m in e c a rs of a ll t y p e s to se rv e the n e e d s of the c o a l in d u s t r y m akes it p o s sib le for us to fu rn ish the m ost m o d ern , efficien t cars for y o u r m ine. R e g a r d le ss of y o u r n e e d s — w h eth e r en d d u m p t y p e , ro ta ry d u m p ty p e , or auto m atic drop-b o tto m t y p e — for th ick or thin seam s — Q.,C,€, c a n m eet y o u r re q u ire m e n ts!. M a n y o u ts ta n d in g Q ,C ,£ features are p r o v i d e d , s u c h as, d o u b le -a c t io n , h e a v y - d u t y , s p r in g b u m p e r s — e le c t r ic a lly w e l d e d. steel. e n d s i l l m e m b e r s —" L u b r i c a t e d " d o o rs for drop-b o tto m cars a n d other refinem ents. W h y not d iscu ss y o u r c a r d e s ig n p ro b lem s w ith our sales r e p r e s e n t a t iv e s —T o d a y ! T h e y are a n x io u s to se rv e y o u .. Q. merican. O r and Xoundry Co.. N E W Y O R K • C H I C A G O • ST. L O U IS . C L E V E L A N D W A S H I N G T O N • P H IL A D E L P H IA • S A N F R A N C IS C O P IT T S B U R G H • H U N T I N G T O N , W . V A . • B E R W IC K , P A .. MINE CARS.

(37) L ook at a V - B e lt in its s h e a v e an d y o u s e e at o n c e that o f th e b e lt do all th e grip p in g on the p u lle y an d g e t all the w ea r a g a in st the s h e a v e -g r o o v e w a ll.. sides. N o tic e , t o o — it’s th e s i d e s that p ick up all th e p o w e r d eliv ered by th e d river p u lley . T h e sid e s t r a n s m i t th a t p o w er to the belt a s a w h o l e . A n d then, o n c e m ore, it’s the s id e s — an d the sid e s a l o n e — th at grip the d riven p u lle y a n d d e l i v e r th e p o w er to it. T h a t is w h y y o u h a v e a lw a y s n o ticed th a t th e s id e w a ll o f the ord in a ry V - B e lt is th e part th at w e a r s o u t first.. —and Here is How the. C O N C A V E SIDE ^REDUCES Sidewall W EAR and Lengthens Belt Life! C le a r ly , sin ce th e sid e w a ll is th e part th at w e a r s o u t first, a n y th in g that p ro lo n g s th e life o f the sid e w a ll w ill le n g th e n th e life o f the b elt. T h e sim p le d ia g ra m s on th e rig h t sh o w e x a c tly w h y th e o rd i n ary, str a ig h t-sid e d V - B e lt g e ts e x c e s s iv e w e a r a lo n g th e m i d d l e o f th e sid e s. T h e y s h o w a lso w h y th e P a te n te d C o n c a v e S id e g r e a tly re d u ce s sid e w a ll w e a r in G a te s V u lc o R o p e s. T h a t is th e sim p le r e a so n w h y y o u r G a te s V u lc o R o p e s are giving; y o u so m uch lo n g er se r v ic e th an a n y str a ig h t-sid e d V - B e lt s ca n p o ssib ly g iv e.. ^More Important N O W That S T R O N G E R Tension Members are Used N o w that G ates Specialized R esearch has resulted in V -B elts having much stronger tension members—tension members of R ayon C ords and Flexible Steel Cables, am ong o th ers—the sidewall of the belt is often called upon to transm it to the pulley much heavier loads. N atu rally , with heavier loading on the sidewall th e life-prolonging C oncave Side is more im portant today than ever before!. THE GA TES RUBBER C O M P A N Y '■World's. Denver, U. S. A.. Largest Maker of V-Belts". S tra ig h t Sided V-Belt H ow S tra ig h t Sided V-Belt B ulges W hen B ending A round I t s P ulley You can a ctually feel th e b u lg in g ' of a i straig h t-sid ed V-Belt by holding th e sides betw een y our fin g er and th u m b and then bending th e belt. N a tu rally , th is bulging produces excessive w ear along the m iddie of the sidew all as indicated by arrow s.. G ates V-Belt w ith P a ten te d Concave Sidewall Show ing H ow Concave Side of G a t e s V - B e l t S tra ig h te n s to M ake P e r fect F i t in Sheave Groove W hen B elt Is B ending Over P ulley. No B ulging a g a in st the sides of th e sheave groove m eans th a t sidew all w e ar is evenly d istrib u te d over th e fu ll w idth of the side wall—and th a t m eans m uch longer life for the b e lt:. D Engineering Offices and Jobber Stocks. IN ALL INDUSTRIAL CENTERS. no. z-a. 71.

(38) lower maintenance costs. Gulf Lubrication Engineer is “in the picture”. This mine helps to insure efficient loading machine operation by adopting the lubrication recommendations of the Gulf Lubrica tion Engineer in the picture (left). O N E A N S W E R to t h e p r o b le m o f g e t t i n g m a x i m u m t o n n a g e f r o m l o a d i n g m a c h in e s is to in s u r e a d e q u a t e ly a g a in s t e x c e s s iv e w e a r a n d p r e m a t u r e f a i l u r e o f v i t a l p a r ts . T h a t ’s w h y s c o r e s o f m in e s k e e p a G u l f L u b r i c a t io n E n g in e e r " in t h e p ic t u r e .” T h r o u g h h is t r a in in g a n d e x p e r ie n c e i n t h e s e le c t i o n o f t h e m o s t s u i t a b l e lu b r ic a n t s a n d t h e m o s t e f f ic ie n t m e a n s o f a p p li c a t io n , h e h e lp s k e e p l o a d i n g m a c h in e s a n d o t h e r m in e e q u ip m e n t w o r k i n g effi c i e n t l y — a n d o u t o f t h e r e p a ir s h o p . M in e s g e t m a n y o t h e r b e n e f its , t o o , f r o m th is c o - o p e r a t iv e s e r v ic e . G u l f L u b r ic a t io n E n g in e e r s h e lp c u t m a in t e n a n c e a n d p o w e r c o s ts , im p r o v e. on. your. m a in t e n a n c e. p r o b le m s .. H is. h e lp fu l. c o u n s e l— a n d G u l f ’s c o m p le t e l i n e o f m o r e t h a n 4 0 0 q u a l i t y o i l s a n d g r e a s e s — a r e a v a ila b le to y o u t h r o u g h 1 2 0 0 w a r e h o u s e s loc a te d in 3 0 s ta te s f r o m M a i n e t o N e w M e x ic o . W r i t e , w ir e , o r p h o n e y o u r n e a r e s t G u l f o ffic e .. Gulf Oil Corporation • Gulf Refining Company D iv is io n S a l e s O ff ic e s :. Boston • N e w Y o r k N e w O r le a n s. • P h ila d e lp h ia * H o u sto n. • P ittsb u rg h • A t la n t a. t L o u isv ille. * T ole d o. s a f e t y , a n d e x t e n d t h e l i f e o f e q u ip m e n t . C a ll in a G u l f L u b r ic a t io n E n g in e e r t o d a y a n d l e t h is k n o w l e d g e a n d e x p e r ie n c e w o r k f o r y o u COAL A G E. •. M a rch . 1947. 43.

(39) N o outside piping needed w ith this G a rd n er-D en v er " W B ” V e r tic a l W ater-Cooled Compressor. Its com bination radiator and air-cooled in tercooler gives it the edge where cooling water is scarce. Remarkably compact, these compressors are avail able in capacities from 142 to 445 cubic feet per minute.. BUILT FOR. Should the supply o f air to this G a rd n er-D en v er H K K S a fe ty H oist fail for any reason, an auto matic brake is instantly applied! T hat’s why this hoist is so popular where safety for load and for operator is final consideration.. M ore footage per sh ift— with less operator fa tig u e ! T h a t ’s w h at y o u g e t in th is Gardner-Denver S3 3 D rill, weighing only 31 pounds and remarkably easy to handle. Four-pawl rotation gives it extra power.. MORE TONNAGE. U sers call this drill the most effective 55pound sinker! Built for heavy duty op eration, it is remarkably easy riding. Fast and powerful, it has conservative air con sumption.. T h e h o ld in g h a n d le o f t h is Gardner-Denver R104 Stoper is located well up on the cylinder to provide better balance and greater sa fe ty in u se. A se lf-r o ta tin g stoper, the R104 has a fully auto matic system o f cleaning air to keep out water and sludge.. This Gardner-Denver CF89H D rifter practically runs it self! Fully automatic in action, the drill feeds itse lf exactly in accordance with the character o f the ground— no need for frequent manual adjustment. For com plété information, write Gardner-Denver Company, Q uincy, Illinois.. G A R D N ER -D EN V E R 44. Mctrch, 1947. •. CO A L A G E.

(40) 1H e K U d d e K. THAT POWERS A 2-TOM HAMMER Another problem solved by A N ew England contractor needed a new steam hose on his pile driver . . . a "muscle” to swing the rig’s 2-ton hammer. H e wanted a top-quality hose that could take the severe operating conditions . . . hammer shocks, pulsa tions caused by varying high pressures, and the deteriorating effect of hot oil shot through the hose to lubricate the hammer. W hen he called on B W H for help, our engineers recommended Bull D og Pile Driver Hose.. a special compound, highly resistant to hot oils. An open-weave fabric anchors the tube to the carcass.. oston. W. This hose performed perfectly on the job . . . it’s still going strong. Bull D og Pile Driver H ose is just one of the many quality products manufac tured by BW H . Whatever your need for industrial rubber goods, look to BW H for dependable ruggedness . . . BW H distributors for dependable service.. The secret of the hose's strength lies in this carcass. It’s made of specially-woven duck, applied at an angle to absorb pressure stresses and shock loads. And because so many plies of duck are used, this sturdy B W H hose far outwears other "under-plied” hose.. HAVE YOU A JOB WHERE STAMINA COUNTS?. The rubber cover is also heat-resisting . . . besides offering protection from abrasion and moisture.. This tough hose has a tube made with. B. IÏ W II. oven. I I ose &. Bring us your toughest problems . . . we're specialists in solving them . C o n sult your nearby B W H distributor,or write to us direct.. rubber company. D is t r ib u t o r s in A ll P r in c ip a l C it ie s WORKS:. COA L A G E. •. M arch , 1947. CAMBRIDGE,. MASS.,. U, S. A .. •. P. O . B O X. 1071,. BOSTON. 3, M A S S .. 45.

(41) 'l l / i ,. D E S I G N ,. B U I L D. B R A D F O R D T h ro u g h the y e a r s since 1891, TJ+T? h a s continued to b u ild the s t a n d a r d type o f B r a d f o r d Breaker. These B r a d f o r d B r e a k e rs rem o ve rock a n d other fo r e ig n m aterials from the coa l a n d a lso reduce the c o a l to the required size. It is e ssentially a p r e lim in a r y c o a l cleaner. A t the s a m e time it functions a s a crusher a n d a s protection to c o k e p la n t or p o w e r p la n t e q u i p m e n t w h ic h Ore B ridge s m a y f o l l o w it. R a ilro a d C a r D um pers. C. E R E C T. B R E A K E R S In 1 9 3 0. built their first o p e n -e n d. B r a d fo r d Breaker, which permits entry o f la r g e r pieces into the b reaker. X /v -?5 o p e n - e n d. b re a k e rs are. b e in g. used w h e re full s e a m m e c h a n iz e d m ining p r o d u c e s a la r g e r p e rc e n t a g e o f refuse a s well a s la r g e r pieces o f rock. The C o a l P re p a ra tio n Plant is thus relieved o f h a n d lin g this fo r e ig n material. N e w im p ro ve ments b y TJ+T* a llo w for scre e n in g the c o a l with a minimum o f d e g r a d a t io n .. High L ift-T u r n o v e r -R o ta r y B o a t Lo a d e rs & Un load ers C a r H a u ls & B o a t M o ve rs B ra d fo rd B re a k e rs C oa l & Coke H a n d lin g Eq uip m en t P ig Iron C a s tin g M ac hin es C o a l P re p a ra tio n P la n ts R o ta ry M in e C a r D um pers C o a l C ru s h ers. I. R e fu s e D is p o s al C a rs C o a l S to ra g e B rid g e s. W A T E R 46. S T R E E T. ". S. I. N. C. E. 1 8 8 7. ". P I T T S B U R G H. M a rc h , 1947. •. COAL A G E.

(42) H a n d l i n g h e a v ie r l o a d s f a s t e r . . . o p e r a t i n g o n s m a l l e r q u a n t it ie s o f l o w - c o s t f u e l s e r v ic in g ,. • • • d e s ig n e d fo r easy. C u m m in s D e p e n d a b l e D i e s e l s a r e t h e s o u r c e. o f p r o f it a b le p o w e r o n h u n d r e d s o f j o b s s u c h a s y o u r s .. * C. U. M. M. COAL A G E. I. N. S. E. N. •. M arch . 1947. G. I N. E. C. O. M. P. A. N. Y. ,. I N C .. •. C. O. L. U. M. B. U. S. ,. I. N. D. I. A. N. A. 47.

(43) let F A B R b F O R G E D cutter bars and chains help you meet today’s higher mining cost. Bowdil co n c a v e cu t t e r bits give 15% to 20% longer life A c tu a l o p e ra tin g records p ro v e B ow dil C o n cav e C u tte r B its g ive 15% to 2 0 %. lo n g er life th a n o rd in a ry b its. .. .. . p lu s im p o rta n t p o w er. savings. T h e co n cav e face p e rm its B ow dil B its to f u n c tio n efficien tly w h en w o rn d o w n 2 5 % f a r th e r th a n o th ers w ith o u t in creasin g pow er d em an d o r p e rc e n ta g e o f d u st. Som e users re p o rt c u ttin g 3 to 5 m ore. Higher wages, higher freight rates, higher costs generally cu t the spread between mining cost and price ceilings. The only answer is greater efficiency, economy and dependability in your mining equipment.. places w ith 2 5 % to 3 0 % m ore coarse c u ttin g s .. Here is how Bowdil Fabri-Forged Cutter Chain and Bars and Bowdil Concave Bits supply that answer . . . help you keep operating profits up.. A U G E R S A N D DRILL BITSspecially heat treat ed, give longer service . . . eliminate grabbing.. FA B R b F O R G E D cutter chain saves time, cuts costs. SP R O C K E T S o f. 1. Elim inates. Dam aged. Guides. and. W earin g. Strips.. B ow dil’s tr u e -ru n n in g rad ial tr a c k g u id e m akes th e ch ain circle th e head a t th e c o rre c t angle. S m o o th , w o b b le-fre e ru n p rev en ts d am ag e to g u id e o r w ea rin g strip s.. 2. Extra Strength.. D ro p -fo rg e d. c o n n e c to r are o f eq u al s tre n g th. lu g. body. and. sy m m etrical. . . . stro n g en o u g h to w ith . F A B R b F O R G E D cutter bars give longer service, produce more coarse cuts, save power. sta n d m a n y tim es n o rm a l loads.. lo n g -w e a rin g , to u g h alloy steel specially h e a t-tre a te d fo r h a rd service. S p ro ck ets in sto c k fo r all p o p u la r m akes o f m achines. A U G E R BITS.. T o u g h , lo n g -w earin g . Fish tail, fo u r p o in t an d tw o p o in t c la y b its.. B O W D IL R O P E SO CKET. Safe, easily in stalled , easily rem oved, lig h t, s tro n g , p ro te c ts th e rope b y p ro v id in g a s tra ig h t p u ll.. 1. Longer Life. F a b ri-F o rg ed C u tt e r Bars are p o p u la r w ith m achine 3. Easy to M aintain. B ow dil desig n m akes c o n n e c tio n , rem oval a n d re p la c e m e n t q u ic k a n d easy. O n e-p iece b it h o ld er, w edging b it secu rely to lu g p ro je c tio n , c a n be q u ic k ly in se rted b y anyone.. 4.. Fast Unit R epairs. B ow d il’s sim ple b it h o ld er an d ing en io u s riv e t lo ck p e rm it q u ic k re p lac e m e n t o f b its o r e n tire lin k s w ith o u t re m o v in g ch a in fro m m achine.. 5.. Long Life. L arg e p in a n d b u sh in g , h e a t tre a te d f o r m a x im u m w earin g life, ta k e th e w ear.. H e a v y shoulders o n lin k s a n d lu g s c a rry th e load a n d shock. . . . d is trib u te stress. . . . le n g th e n life an d increase efficiency o f en tire. c u ttin g en d o f m ach in e.. coal mining equipment. ru n n e rs, fo rem en , m a in te n a n c e m en an d o p erato rs alike because th e y give lo nger, tro u b le -fre e service . . . elim in ate sh u t-d o w n s fo r repairs. B u ilt th r o u g h o u t o f h ig h -s tre n g th alloy steels w ith la rg e r b earin g su rfaces, th e y sta n d u p lo n g er in to u g h service.. 2. Stronger. A ll-w eld ed c o n s tru c tio n elim inates riv e t holes in th e body, re ta in in g fu ll s tre n g th o f th e m aterial.. 3. Less Deflection. A c tu a l te sts.sh o w t h a t w hile co n v e n tio n a l bars 4 " t h i c k w ill b end u n d e r 25 to '35 to n s pressure b etw een th ree fo o t cen te rs, F ab ri-F o rg e d B ars 3 " t h i c k w ill w ith s ta n d 40 to 45 to n s b efo re b e n d in g . F a b ri-F o rg e d C u tt e r B ars are available to fit 75 d iffe re n t types o f sh o rt w all, long w all, a rc w a ll an d tr a c k c u t tin g m ach in es o f all p o p u la r m akes.. BO W D IL CANTON,. OHIO. COMPANY. S P IK E PULLER. D eta c h a b le claw s, easily re . m oved fo r re p lacem en t o f c h an g e o f spike size. W o n ’t b end spikes. M IN E R S ' P IC K S.. R eplaceable p o in ts h eattre a te d fo r long service. D esigned fo r ideal w e ig h t and balance. B O W D IL. C H O K E -A R C. TRAN SFER. S W IT C H .. In s ta n ta n e o u s in o p e ratio n , dependable, tr o u ble free. T W O -P O L E CABLE A N D REEL S W IT C H . Sturdy, dependable, durable.. FIELD M E N A N D R EPR ESEN T A T IV ES IN Whitesburg, Kentucky; W e st Frankford, III.; Charleroi, Pa.; Denver, Colo.; Big Stone G ap, Va.; Williamson, W . Va.; Canton, Ohio; Birmingham, Ala.; Helper, Utah; Kansas City, Mo.; Centerville, Iowa; Topeka, Kansas; New Castle, England..

(44) GOES WHERE THE. GOING. GETS. N. ow here. is found a. warmer welcome for flexible, lig h t weight air hose that can really take it than in coal mining. Difficult, awk ward working conditions put a high premium on hose that is easy to handle. C onstant dragging over sharp, ab rasive surfaces, crushing under heavy, jagged lumps, require extra resilience and strength if the hose is to provide maximum service. Republic technolo gists designed Tower Pneumatic Hose expressly to meet this combination of requirements, a light yet rugged con struction to go where the going gets rough. Tow er does go there every day, thanks to the leading preference it has won at mines in every area. Order from your Republic Distributor.. 1 . S eam less, oil and h e a t- r e s is t a n t, ex tru d e d ru b b e r tu b e . 2 , H ig h te n sile , tw iste d c o rd s b ra id e d in to seam less, tu b u la r p lies. 3 . R u b b e r in su la tin g layers a s su rin g firm ply ad h e sio n . A , S p ecial a b ra sio n , c u t, w e a th e r and s u n - r e s istin g ru b b e r co v e r, ex tru d e d w ith o u t seam .. REPUBLIC RUBBER M o r e Service from R U B B E R LEE. E P U B L IC I N D U S T R I A L P R O D U C T S YOUNGSTOW N, O I. k. DELUXE. T IR ES. AND. TUBES. C O N S H O H O C K EN , PA.. for I n d u s t r y. ¡g«**: M a rch . 1947. •. COA L AGE. \.

(45) le s s m a n p o w e r t o s e t u p a lu m i n u m. su p p o r ts. t h e y ’ll t a k e h a r d s e r v ic e . T h e y c a n b e m o v ed fa st an d. a r e e a s y t o h a n d le ,. as r o o f su p p o r ts. a t w o r k in g. la c e s ,. A lu m in u m S t r u c t u r a l S h a p e s g i v e lo n g e r s e r v ic e o n t h e j o b . . . s t a n d u p w e ll i n s t o r a g e . H i g h l y r e s i s t a n t t o c o r r o s io n , t h e s e a l u m i n u m b e a m s are m in e w o r th y a n d a re n o t i n f la m m a b le . For. w o r k in g. fa ce. roof. s u p p o r ls. in. m in e s , t u n n e l s , a n d e x c a v a t i o n s , A lc o a S t r u c t u r a l S h a p e s p r o v id e a h i g h s a f e t y f a c t o r , a r e e c o n o m ic a l a s w e ll . A lc o a e n g in e e r s w ill h e lp y o u c h o o s e s h a p e s to. s u it. your. stre n g th. r e q u ir e . m e n ts. A lu m in u m C o m p a n y o f A m e r ic a , 1763. G u lf. B ld g .,. P i t t s b u r g h 1 9 , P a . O ffic e s in le a d in g c i t i e s .. COAL A G E. •. M a rch , 1947. 51.

(46) T he split'- n o s in g on t h is 1 0 ' d ia m e te r h ig h p r e s s u r e V a n e A x i a l f lo w f a n a f f o r d s e a s y a c c e ss t o b e a r in g s a n d s h a f t a s s e m b ly . S t re a m lin e d b elt f a ir in g s p ro te c t b elts fro m t h e a ir stre a m .. T h e co m p le te r o t o r a s s e m b ly o f a 1 0 ' d ia m e te r h ig h p r e s su re f a n s h o w s h o w a d ju st a b le p itch p r o p e lle r b la d e s a re s ta t ic a lly b a la n c e d o n s p e c ia lly d e s ig n e d La D e l m a c h in e s.. LA •DEL D ivision. JOY LOADERS load more tonnage k faster!. -. JOT MANUFACTURING CO G EN ERA L. O F F IC E S :. H EN RY. •. P IT T S B U R G H.

(47) with. ,F r o m a s t a n d p o in t o f s a f e t y t h e r e 's t h e im p o r ta n t fa c t t h a t P R IM A C O R D c u r r e n ts w h ic h. m ig h t c a u s e. d. t h e fo r c e o f a p r im e r c a r tr id g e r e s u ltin g in a m o r e. is n o t s e n s i t iv e t o s t r a y. p o w e r fu l d e t o n a t io n o f t h e fu ll c h a r g e in e a c h h o le .. a p r e m a t u r e b la s t.. L o a d in g is le ss h a z a r d o u s , t o o , s in c e c a p s. P rlsB. A n d P R IM A C O R D 'S d e t o n a t in g w a v e , m o v in g a t. never. 2 1 ,0 0 0 f e e t p er s e c o n d in a d e fin ite b u r d e n -r e lie v in g. g o in to a h o le . O n ly o n e c a p , a t ta c h e d to t h e e n d. s e q u e n c e fro m h o le to h o le , r o w t o r o w , p r o d u c e s. o f a tr u n k lin e j u s t b e fo r e t h e b la s t , is n e e d e d to fire t h e s h o t.. t h e k in d o f t h o r o u g h ly - b la s t e d o v e r b u r d e n s y o u r d r a g -lin e s c a n h a n d le q u ic k ly a n d e ffic ie n tly .. F rom. a s t a n d p o in t. o f e ffic ie n c y. P R IM A C O R D. A n y w a y y o u lo o k a t it, w e ll-p la n n e d P R T M A -. a c t u a lly g e t s m o r e w o r k fro m e x p lo s iv e s . E v e r y. C O R D s h o ts a re b o u n d t o r e d u c e y o u r o p e r a tin g. c a r tr id g e in c o n t a c t w it h P R IM A C O R D g o e s w it h. c o s t s , in c r e a s e y o u r p r o fits !. THE. ENSIGN-BICKFORD. COMPANY. •. SIMSBURY,. CONNECTICUT. PRIMACORO-BICKFORD FUSE 54. M arch, 1947. •. COAL AGE.