. Eisenbahn- und Lokomotivtechnik: Eine praktische Zeitschrift der Eisenbahn-Triebkraft und des rollenden Stoffes. engers wurde entlang irgendein Teil der Linie an der Ratevon fünfzehn Meilen pro Stunde gezogen; aber dieses war zweifellos ein bloßes Experiment. Die oder-dinary Geschwindigkeit ist nicht wahrscheinlich, sechs Meilen zu überschreiten, wie oben angegeben; aber diese Geschwindigkeit und die Beschäftigung einer einfachen Schiene ist zweifellos eine beträchtliche Verbesserung auf den Lokomotivwagen nahe Lcc<ls. Travel auf einem Gestell fahren oder 1,400 lbs erfordern. Zugstange Zug zu überkommenem Grade, ohne Reibung. Assum-ing die Motoren wurden doppelt handeln-ing die üblichen tractive powe

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. Railway and locomotive engineering : a practical journal of railway motive power and rolling stock . engers was drawnalong some part of the line at the rateof fifteen miles per hour; but this wasdoubtless a mere experiment. The or-dinary speed is not likely to exceedsix miles as above stated; but this speedand the employment of a plain rail iscertainly a considerable improvementupon the locomotive carriages nearLcc<ls. which travel upon a rack or require 1, 400 lbs. draw-bar pull to over-come grade, without friction. Assum-ing the engines to have been double act-ing the usual tractive power formulaindicates a tractive power of about 1, 340lbs. (This is allowing the usual 15 percent, for drop in pressure, wire draw-ing, etc., and in this case, engine fric-tion). Evidently the cars had ball bear-ings or other friclionless devices sincethe grade resistance overcome, withoutcounting anything else, such as - carjournal or flange friction, was alreadygreater than the power of the engine.Or, assuming that the two tonsweight of carriages was gross, thegrade resistance was 1, 080 lbs., which, . MRlIKiK .T 1-OKT STICICI.. WYOMING. subtracted from the tractive power ofthe engine, leaves 260 lbs. available toovercome friction, etc., or in this case6< lbs. per ton, which is about as lowas any one dares put it even nowadays. From all of which it appears that ourancestral yardmasters put just as muchbehind an engine in proportion to itspower as the best of thcni do nowa-days. Or maybe this bit of hsiory con-sidered in the light of heredity explainswhat we have all wondered at, in whichcase we mustnt blame the yardmaster, as he was born that way. Urbana. III. E. W. Fiske. May, igog. RAILWAY AND LOCOMOTIVE ENGINEERING 19: Tonnage Rating and Efficiency. Editor: It has long been recognized that anymachine will show a maximum efficiencyonly when working to its full capacity, nomore, no less. If it is overloaded it iswasteful of the energy supplied to it; soonshows distress in some

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• bookcentury1900
• bookdecade1900
• bookidrailwaylocom
• bookyear1901