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Fuller Compressors where you need the air lifter operates on tha ttmt as iho glass-envelope tubc. PBc and 29, and in that sense U ironic lube. The reciilUt h**** **! cury-pool cathode, lor Isrie^ * ** psetiy instead o( one ol 0 has a graphite grid and anU v.v*^ grid in Fig. 29, and serves iba^UL purpose. When w discus reetuSfl construction and operation ol arc rectifiers will bo considered! YOU GET A gmofifo&sy Closing CHAPMAN ^CHECK VALVES Press-Fitting a Rotor (Continued from page ?l) ctmyli/icdd cu/i & /00-M a/Acet Jba/&t fifyMuA6 u/ic&tMc utfiA? Hove you over considered Iho advantage and savings possible by "spoiling" Fuller Rotary Compressors where air Is noedod. and at pressures to do the work required most ofllcionfly? It costs manor to compress air at one central point with large, high-pressure units working on pressures equal to the highest demands from any part oi the plant, and thon reduce It to from 10 to SO*lb. for any one particular use. The installation illustrated above is a very good example ol a Fuller "spotted" unit. Compressed air was available from a cen tral compressor station but at a much higher pressure than needed for that particular work to be done. Rather than use air through a reducing valve, with the attendant lossos. It was decided to Install a Fuller Rotary Compressor to produce air at the doslrod prossure. i'hls resulted In considerable saving In power, costly transmission Unes. irictlon losses and lino leakage. And. when the department has completed ItB dally cycle oi operation, the compressor Is shut down. FULLER COMPANY. CATASAUOUA. PA. Chicago 3 120 So. USn St San Francisco 4 420 Chancery Bldg. c-ieo 131 |377b| number o( bolls that can be reada, threaded into the end of the shaft. Three 2Yh-in. nickel-steel bolls take over 400-ton load without'distress distortion oi their threads. When span between hub and shaft end is^toe short for a standard jack, longer bob, ore used to permit locating the piste away from the shaft's end to accoosiadate the jacks. On vertical generators the ihrusv bearing block can he used at a prating plate to assemble the shaft and rotor. On aueh machines the rotor's air-brake units may be used as jacks to press the rotor on the shaft. Pressing plates art now made of fas tens) that can be picked up on the job. Sometimes square or triangular steel plates 2 In. thick are fastened to gether, the number depending on tbs number of jacks used. When the shaft has a forged-on coupling e pressing plate con be filled . on the abaft inside the coupling or against the oil-shcdder collar on the-'* hearing journal. These have been ntdo from four steel plstes aboul 2% shift diameters long, and one-half as vide Cut a half circle slightly smaller than the shaft diameter out of one side of each plate. Ploce two pletel side by aide and the other pair crosswise of them os In Fig. 5. Drill, ream and (it body-hound bolts through the plates to hold than to gether securely. Bore the center hob to e snug fit on the shaft and machine a radius on one edge of the hole to match the coupling or oil shedder, de pending on where the strongback is used. If it is used on the oil shedder, fit o copper liner or shims to protect the journal-bearing and oil-sheddcr surfaces. Mateh mark the plates, remove the bolts and reassemble the former oa the shaft. Being at right angles to ^ plate's surfaces the body-bound bolu POWER Jim. INI ;j ^ The smooth, cushioned dosing of Chapman Tilling Disc Check Valves is based on the design of the balanced hinge-pinned disc. When the valve is open, the disc rides evenly in the-flow. On closing, the disc seat drops into contact with the body scat easily and Wcf/jp--'cushioned by the effect of the stream against the short Rap. Vibrations and destructive stresses in pipe lines re thereby reduced. With this unique check valve, maintenance costs are cut, and head losses arc reduced as much as 65% to 80% over those experienced with conventional type check valves. Available in cither iron or steel. fend Hdtr for tulli!a cemilntna complete iaformuion. SOWER Juno 1948 CroM-fMttoa of <ht Chtpatm TiJrfn* Otic Chech Vilt illvuMiing the wsy.that tha balanced diseii tupponrd on it> pitot, with arrow* iftow/na (t> travel of the Cite. A feamte of ibt dttigt* li that iht diac aaat tifti awtr from iha fcodp teat tia openins. and drop, into contact trhn dodos, with oo tlidini or vttrfai of the hhi. The Chapman Valve Manufacturing Company INBMN UIHlIt, t.