. Railway and locomotive engineering : a practical journal of railway motive power and rolling stock . passage f in the low pressure steamcylinder, so that steam can flowthrough these ports into the lower endof the low pressure cylinder and causepiston 8. to make its up stroke. Port kis now in register with port c, and livesteam can flow into the high pressuresteam cylinder above piston 7 and causethis piston to make its down stroke. upper end of thehigh pressure aircylinder. Piston 10,descending, com-presses the air it, which wasforced into its cylin-der by the low pres-sure air pisto
. Railway and locomotive engineering : a practical journal of railway motive power and rolling stock . passage f in the low pressure steamcylinder, so that steam can flowthrough these ports into the lower endof the low pressure cylinder and causepiston 8. to make its up stroke. Port kis now in register with port c, and livesteam can flow into the high pressuresteam cylinder above piston 7 and causethis piston to make its down stroke. upper end of thehigh pressure aircylinder. Piston 10,descending, com-presses the air it, which wasforced into its cylin-der by the low pres-sure air piston onits previous downstroke, and forces itthrough the lowerdischarge air valve42 into the mainreservoir. On thereversal of thestrokes a similar op-eration is had andthe air in the highpressure air cylinderabove piston 10 isl i-ioforced out throughupper air discharge valve 41 to the main reservoir; at thesame time the air below the low pressureair piston 9 is being forced through lowerintermediate air valve 40 into the lowerend of the high pressure air it will be seen that as the low. 40 3B DIAGRAM OF THE CROSS COMPOUND PUMP DOWN-STROKE, HIGH-PRESSURE-STEAM SIDE. Other cylinders of the pump, both airand steam, and this accounts satisfac-torily for the high percentage of effi-ciency shown by it in all tests to whichit has been following table shows the com- August, 1906. RAILWAY AND LOCOMOTIVE ENGINEERING 379 parative efficiency of the various loco- tlie marle oi Pump. 9 ^^-inch U-incli Tandem New York Duplex No. >4-inch Cross-Compound. Steam PrcssurelPounds. 200200200200200 Constant Main Reservoir Pressure. 130130130130130 Angle Cock With Handle Lock. In tlie half-tone engravings, Ilgs. 5and 6, is illustrated an angle cockhandle having a safety lock, which pre-vents accidental closing of the anglecock. To turn the handle cither from closedto open or from open to closed posi-tion, it must first be raised so that t
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Keywords: ., bookcentury1900, bookdecade1900, booksubjectrailroa, bookyear1901
