. Railway and locomotive engineering : a practical journal of railway motive power and rolling stock . in the mainstructure of the ship. March, 1911. RAILWAY AXU LOCOMOTIVE ENGINEERING. 121 Air Brake Department Conducted by G. W. Kiehm \0Vz-m. Cross-Compound Pump. The illustrations shown arc of theWestinghouse 10j4-in. cross-compoundair pump. This compressor was originallyintended for industrial enterprises; as itis capable of delivering a high air pres-sure with a comparatively low steampressure. Such being the case, it is ob- remains the same, low pressun . I Ihigh pressure, 9 ins. From the
. Railway and locomotive engineering : a practical journal of railway motive power and rolling stock . in the mainstructure of the ship. March, 1911. RAILWAY AXU LOCOMOTIVE ENGINEERING. 121 Air Brake Department Conducted by G. W. Kiehm \0Vz-m. Cross-Compound Pump. The illustrations shown arc of theWestinghouse 10j4-in. cross-compoundair pump. This compressor was originallyintended for industrial enterprises; as itis capable of delivering a high air pres-sure with a comparatively low steampressure. Such being the case, it is ob- remains the same, low pressun . I Ihigh pressure, 9 ins. From the illustrations it will be observed that the piston valve is used fordistributing steam and tin reversing gearembraces the usual valve anil rod. as withall Westinghouse steam-driven pumps. The pump is tapped for a In steam 13(1 lbs, steam pressure the pumppn ed air to 140 lbs. pressure andoperated at a speed of 130 strokes aminute. Ilider the conditions mentioned thepump shows an efficiency of H3 per cent.,and when steam pressure falls to 100 pump will run at a rate of 128 tj r*j° fo* f^ Strokes a minute against 80 lbs. air pres-sure. The advantages of this type ofcompressor under low steam conditions isapparent. 1054-IN. CROSS COMPOUND AIR PUMP. vious that it is particularly adapted forthe types of locomotives using super-heated steam, and in some instances isused on locomotives which do not usesuperheaters. The construction of the pump is iden-tical with that of the 8j4-in. compressor,but the high pressure steam piston is10^2 ins. and the low pressure steampiston is 16J/2 ins., as against %Vz ins. and14J/2 ins., respectively, with the smallerpump, but the bore of the air cylinders pipe and a 2-in. exhaust, and undersuperheat steam pressure the perform-ance of this pump would be as follows, itbeing understood that superheated steamis referred to only as a basis for steampressure per sq. in., which is usuallyabout 150 lbs. on this class of locomo-tive. With 148 lbs. s
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