. Railway and locomotive engineering : a practical journal of railway motive power and rolling stock . rites:Given the draw bar pull or tractive pow-er of a locomotive with 2ox28-inch cylin-ders, to be 34,000 lbs., kindly give formulato find rating in tons of this sized loco-motive on road with one per cent, —Minimum resistance due to friction atabout 6 miles per hour, 6% lbs. per due to gravity (i per cent, ofweight), 20 lbs. per ton. Total resistanceper ton on I per cent, grade, 2654 bs. Then 34,000 - ,, / = 1,29s tons gross weight of tram. 20/f The Cleveland Pneumatic
. Railway and locomotive engineering : a practical journal of railway motive power and rolling stock . rites:Given the draw bar pull or tractive pow-er of a locomotive with 2ox28-inch cylin-ders, to be 34,000 lbs., kindly give formulato find rating in tons of this sized loco-motive on road with one per cent, —Minimum resistance due to friction atabout 6 miles per hour, 6% lbs. per due to gravity (i per cent, ofweight), 20 lbs. per ton. Total resistanceper ton on I per cent, grade, 2654 bs. Then 34,000 - ,, / = 1,29s tons gross weight of tram. 20/f The Cleveland Pneumatic Tool Com-pany, Cleveland, Ohio, have purchased atract of land on Hawthorne and Secondavenues, and will at once begin the erec-tion of modern factory buildings. August, 1902. RAILWAY ANL) LOCOMOTIVE ENGINEERING 355 Air=Brake Department. CONDUCTBD BY F. M. NKI^LIS. Yard Test of Triple Valves. A special valve for use in coiiucclionwith the yard test o( triple valves is shownin Figure i. It is so designed that, re-gardless of the length of train, or amountof leakage, the rise of train-pipe pressure. /•ipa Fig. 1 —VAtVE FOR TRIPLE VALVETESTING DEVICE. is always at a predetermined number ofpounds per minute. This rise correspondsto the conditions existing at the end ofa long air train when a release is made,if the usual main reservoir pressure anda main reservoir of recommended capacitybe employed. Operation of Device. As air from theyard plant or engine enters the valve at A(Fig. !■)> it is free to pass through portB into chamber D. Train-pipe pressurecan always be maintained in chamber Lunder diaphragm 2 by means of ports Hand M. Air in port B is free to passthrough small pin hole /, thence throughport C, and out at E to the controllingreservoir. Owing to the unchanging vol-ume of the controlling reservoir, a con-stant predetermined rise of pressure is ob-tained, and this pressure is always freeto reach chamber G. When the pressurein this chamber is greater than that in
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Keywords: ., bookcentury1900, bookdecade1900, booksubjectrailroa, bookyear1901
