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MALLEABLE IRON UNION^ Plainly Marked far your Protection Wkoa you bay union*, look fo> tho ant-in.matal marking of the word "JtFPfISON" and the flgtret donating rolnd working pressure and du. Such meeting h for your protection to flitnre you that yoa oro getting gonoino "Jalforooni" and to help yoa loloet the proper tito for dm in the tarrleo in* tended. "JCFFEBSONS" bar* Undonrrilon' op* proal for rating* of 2000 pti non-ibock O.W.G. in *lie* from M" to 2-U. in* ciotlro and 1000 p*i in 2)4, J and 4*io. it**. Tfiata rating* boro bate ochiorod through Jefferson design aad conttrvc* Hon including such feature* ai: olr furnoeo rpolWobi# iron of 55,000 pii aroragt tonsil* ttrongtfi, uet ring* of stoniest drown brat* tubing, a ground joint tbot.H'truly spherical ond the *itlnio Jtllmon Recouod trot* Soot. Jefferson olio noeofectvrei: AAt mole and female poioot/Cndoro 300$. Excel. 1501 ond Matter ISOS onion*. All type* pro alto available .with all-iron teat*. (Set in touch with your noorost diitribw* tor. or with *` dirtt'i for your require ment*. JEFFERSON UNION CO. 40S W. Idtb St.. Now York 1. M. V. AS Deeding !. loekport, N. Y. J9 Neither A*#., ioRlagtoo 7|. Moss. More TECHNICAL BRIEFS M pOp lit lion automatically in response to fringe changes should be investigated if the fringe load variations limit the max* imum scheduled power transfer on the lies to neighboring areas, or if the rate of change of generation in response to sustained load changes approaches the rote of change of the fringe load varia tions. If it is necessary to control au* tomntically in response to fringe Joed changes, it is highly desirable from on operating standpoint that the percent age of fringe notion assigned to the regulating stations and units be adjust* able independently of the percentage of the sustained control action assigned to these stations and units. AIEE Paper No. S3 147. Electric Distribution ond Control for lighting Systems. By W H Kohler, &cillnghouse Electric Corp and R N Bell, E / du Pont He Nemours A Co. Higher Illumination levels and new lighting sources make It necessary to re-examine passible methods of power distribution and control for lighting loads. As a result of the higher lighting density and versatile lighting sources, the designer must now exercise a con siderable amount of engineering judg ment In planning a distribution system. New design techniques make it possible to provide maximum convenience and reliability at minimum cost and with a minimum use of critical materials. Some of the requirements of the different lighting sources and modern trends in power distribution and control for light ing loads are discussed and analysed. Conclusions are reached that the In- vestment in the disirlbuiton system for supplying lighting loads ean be consid erably redueed by installing a combined power and lighting arrangement In which the lights are supplied directly from the 460-v supply. The reluctance of many individuals to go to voltages higher than 120 for lighting, plus the failure of most distribution engineers to recognise the inherently lower cost end copper eatings in this type of sys tem, is apparently responsible for the 460-v supply to lighting load not being more widely used. . The line to neutral connection of the 1 lights on 460-v systems appears to be the most practical method at the pres ent time. Connecting the tights line to line on either 460-v della or a 460-v grounded wye system is feasible aod of fers the advantage of iltghtly lower cost branch circuits from the panel board. However, 1ine-to-line connections of lights make it necessary to use either 2- or 3-pole breakers in the lighting FUIlS AND COMBUST!! HANDBOOK i.\t W' dm nrociknl old Is ih of (gab ond Ml OM of sirsgulprarat. Applies rapid rmT., eiu of ollseiMttt chtJTr'? porativo Ukw to abow MvomL vantofm, Kuw to., of optional oqnlpuMitt end Meth od*. B4U4 hr A. J. JohMow, Coe*. Roc, ond G. H. Aoth, Vlllonovo Coll. SIS op.. * Ulna.. it*.os MECHANICAL ENGINEERS' HANDBOOK Mato or* nick an* war* to tMr aa*t trooblmwa touttoii . . o*or 1.100 pot*o of dato In ovarp branch et imehonleaj onflnoorin* -- from aroeoatla to mochselcel rofriscrailon, from po**r tanorotlon to BMtot-eutttnf BMhtncs to M.-.a *. vorlnp. This handbook covers Itoory i arda. ond prootloo. and baa boas --... kr nvor 100 Mpcrtt. cneh * ipoctalbtlTS Add. Thlt odlltoo include* onab Said raoehonlto. alrvrnfl Jet tclovtaton, oolar httllnf, Mod PUNT ENGINEERING HANDBOOK llrfnfo to (ho nm rocponglbl* ft . "homln*" of Antrtcan ladoitry nW1 ilM< handbooh ggnpartkh Is tiiBD thorwushum ot tmUMat to tho bon < shla to othor onpteotrliia men onoo ruldg of U________ fact*. carvfolb *>no< in f tho particular r~* I plant oporaUa* I n*L from It* new I paten of dtocrtpUoon1 I nluma, tablet, (hart* | prom*, nolhndv I pointer* pet an t*t I answer to qnctthn a quesUeo^to o**Ur wdi im of plant alBOBhKl It oonmea. Bdlud b* BunUr. 1*11 Uhi*w SIAM 10 Doyi' nn Ml amd me book (II thgghad Batov fw 1* W "V, aelmtla an itgunL to 1* tor* > ** *1!] hertls] t kaap aha fro esnU tm so tettar (Miato. uu mm wmomt W pagtpalA (Wo W toUtVfp etoras tl Srst tomf&MM wfih ifeU mom) *** 1-1 pctdlet*.! jJ Jaham A AMb--fsst * C*etoUI lu.tot torsbl* I* In i* dsn. *"^|| Start*--OwtoalcaJ lulm1 NMWparaot* I* to l* tor*. U *{1 Otmlar--Pto*t Cooloasrla* partsI* U la f* dirt. U omt DUtcilofft tor wdt/fng poport m p IU I Tali gfer aptllc* la U.S. wH hi*tcii*sti*t*<v' g mK>wwf,,l MAf !| RUSHING UNLIMITED! [/fie story of 61,000,000 tons of coal crushed at less than K per ton! s (octi oro Inf The story of American Crusher - ^rugged, long-life-low-cost performonco--I* now Is for your cereful study. Not just one cose history, or d reportt-but a thorough survey of American InstalbypowBr plants, central stations, and mind) across the a. Here ore (ha "crushing" facts: Total Tonnage Handled...........01,000,000 Tons Average Age of Crushers..................... 0.5 Yean Replacement Parts (Including Standby Ports) 1/10 of W per Ton can be no belter proof of American's superlative e and economy of operation! `CATIO '-Confror *totb* 'XXAtt <*00.000 . I.OOO75 1 C--'*Ik. 1.S *C3.( / '0.00,',000 J fall I * 0005 c 30.$ ( f-0007 ei#* * 0OO4 6 Fvori M WRITE Today for your copy of "Crushing Cool of lost Than H Ton" PULVERIZER COMPANY Oii^inaX<yu and 7f(aMufr)ttwitnAo$ `JRCuy (fau&eto curd PuieeUftM 1349 Mackllnd Ave. St. Louis 10, Mo. P1 * n 1)