Modern American locomotive engines; their design, construction and management. A practical work for practical men (1883)
Edwards, Emory, b. 1841 · Bridgeport, Conn., Frederick Keppy · leaf 193
n for the experiment, the valve ofwhich resembled Fig. 56, placing the valve on theports so as to allow the exhaust passage to be three-eighths of an inch open, the steam port at the sametime to be one-quarter of an inch open. This space,therefore, was closed by adding to the length of thevalve at… … Fig. 56. needless to say the saving of fuel was very great.The amount by which the valve at each end overlapsthe steam ports (see Fig. 56) when placed exactly overthem is technically termed the lap. The lap of thevalve being three-eighths of an inch, the exhaust pas-sage was about three-eighths of…
Locomotives
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