. Locomotive engineering : a practical journal of railway motive power and rolling stock . to 60 poundgage pressure, will be found by multiply-ing 402 by , and dividing the productby which ,11. the space occu-pied at 60 pounds gage pressure as 214cubic inches, instead of 107 5, found byMr. Kelly, through multiplying 402 by25, and dividing by to. Deducting thisspace from 4o_> cubii inches leaves 188 pound gagi pn appose this air now be compressed into such space thatthe gage pressure shall be raised to 60 Is. The volume of this space will. multiplying 2,ooo by (thenr at
. Locomotive engineering : a practical journal of railway motive power and rolling stock . to 60 poundgage pressure, will be found by multiply-ing 402 by , and dividing the productby which ,11. the space occu-pied at 60 pounds gage pressure as 214cubic inches, instead of 107 5, found byMr. Kelly, through multiplying 402 by25, and dividing by to. Deducting thisspace from 4o_> cubii inches leaves 188 pound gagi pn appose this air now be compressed into such space thatthe gage pressure shall be raised to 60 Is. The volume of this space will. multiplying 2,ooo by (thenr at 50 pounds gagepressure) and dividing by (the abso-lute pi. nre of air at 60 pounds gage 11). which results in giving us 1,732cubic inches, Thi difference between thevolume occupied by the air at 50 pounds000 cubic inches) and that oc-cupied by the same air at 60 pounds gagepressure ( 1,732 cubic inches) is the spacewhich must be filled with air at 60 poundspressure from the train pipe, and which is268 cubic inches. As before stated, a por-tion of the air from the auxiliary reser-. VIKW NO. 4 IAII. \ All! IUiAKE lvKPAIK AND INKTUUCTIOX ROOMS, ST. PAUL, MINN in the brake cylinder in a graduated ap-plication than in an emergency applica-tion. The next serious defect in our corre-spondents solution is his assumption thatMariottes law refers to gage pressuresinstead of absolute pressures. To illus-trate, let us consider his example. Heassumes that, with an eight-inch pistontravel, the brake cylinder volume is 402cubic inches. This takes no accountwhatever of the clearance in the brake cyl-inder when the brakes are released. Thebrake cylinder clearance is somewherein the neighborhood of a volume equal tothat of one inch piston displacement, orabout 50 cubic inches. The brake cyl-inder volume is therefore about 400 cubicinches for a seven-inch travel instead of an cubic inches oi space to be filled with 60 pounds gage pressure, from the trainpipe, instead of
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