Cyclopedia of applied electricity : a general reference work on direct-current generators and motors, storage batteries, electrochemistry, welding, electric wiring, meters, electric lighting, electric railways, power stations, switchboards, power transmission, alternating-current machinery, telegraphy, etc. . e weight of the car. The sizescommonly used are 8, 10, and 12inches in diameter. Operating Valve. The purposeand operation of the operatingvalve have already been describedas well as the four positions of thevalve. In describing the mechanicaldetails, reference will be made toFigs. 93, 94
Cyclopedia of applied electricity : a general reference work on direct-current generators and motors, storage batteries, electrochemistry, welding, electric wiring, meters, electric lighting, electric railways, power stations, switchboards, power transmission, alternating-current machinery, telegraphy, etc. . e weight of the car. The sizescommonly used are 8, 10, and 12inches in diameter. Operating Valve. The purposeand operation of the operatingvalve have already been describedas well as the four positions of thevalve. In describing the mechanicaldetails, reference will be made toFigs. 93, 94, and 95. The valve iscast in two parts—the base 1 andthe head and body 2. On the topof the head is a double gauge 3;the red hand indicates the reservoirpressure; and the black hand, thebrake-cylinder pressure. Just belowthe gauge is a socket into whichfits the operating handle 4j w^hichis removable. In swinging fromthe release position to the emer-gency position, the handle turnsthrough about 130 degrees. The handle can be inserted and with-drawn only when the valve is in lap position. When the handleis withdrawn, the latch 5 is thrown into position by a small spring,and the valve is permanently locked until the handle is again in-serted. Just below the handle socket is a second one which contain*!. <^linder Be^crvoir* Fig. 94. Section of Air Operating Valve 195 100 ELECTRIC RAILWAYS a bolt G actuated bj a spring. As the handle is turned, the headof the bolt 6 passes over notches which serve to indicate when thevalve is in the proper position. Connected to the lower side of thesocket is the stem 7, having a pinion fitted to its lower end, whichactuates the rack 8. The rack 8 is connected to and operates theslide valve 9. The spring plate 10 does not act as a stop for the slidevalve 9, but is used only to assist in getting the valve in the properposition when assembling the parts. The slide valve 9 moves be-tween suitable guides 11 and 12. The chamber A is always incommuni
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Keywords: ., bookauthoramericantechnicalsoci, bookcentury1900, bookdecade1910
