Locomotive catechism; an up-to-date, practical and complete work on the locomotive--treating on the design, construction, repair and running of all kinds of locomotives .. (1908)
Grimshaw, Robert, 1850- [from old catalog] · New York, The N. W. Henley publishing company · leaf 250
Fig. 144. Bristol Roller Valve. having a little play in their journals. Steel plates were attachedto the valve on each side and others to the valve seat, so thatthe rollers rested on the latter below and the valve was … Fig. 145. Bristol Roller Valve. carried by the upper plates, which in turn rested on therollers. The pressure of the valve was carried on the rollers;and as it wore there was little or no contact between its faceand seat. 244 LOCOMOTIVE CATECHISM. PISTON. VALVES, Q. What is a plain piston valve? A.…
Locomotives
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