Locomotive engine running and management .. (1899)
Sinclair, Angus, 1841-1919 · New York, J. Wiley & sons; [etc., etc.] · leaf 238
MOTION. 189 in Fig. 7. This extension of the valve is called out-side lap, or simply lap. The effect of lap is to closethe steam-port before the piston reaches the end ofthe stroke, and the point at which the steam-port isclosed is known as the point of cut-off. When thesteam is cut off and… … Quarter SizeFig. 7. When a slide-valve is actuated by an eccentric con-nected directly with the rocker-arm or valve-stem, thepoint of cut-off caused by the extent of lap, remainsthe same till a change is made on the valve, or on thethrow of the eccentric, unless an independent cut-offvalve be…
Locomotives
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