Ripper, William, 1853-1937 · London, New York [etc.] : Longmans, Green and co. · leaf 399
The forward or backward motion of the engine is determined by THE LOCOMOTIVE. 377 giving the slot an inclined position on one or other side of thevertical line as required. When the slot is in anexactly central position, thisposition i3 mid-gear travel ofthe valve, and the steam isadmitted at each…
Steam-engines
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