All About Engines
Forfatter: Edward Cressy
År: 1918
Forlag: Cassell and Company, LTD
Sted: London, New York, Toronto and Melbourne
Sider: 352
UDK: 621 1
With a coloured Frontispiece, and 182 halftone Illustrations and Diagrams.
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258 All About Engines
due to Stephenson, or rather to one of Stephenson’s
workmen named Howe, which deserves a separate
paragraph for its description. This is the link motion
or reversing gear to enable the engine to run for-
wards or backwards.
The arrangement shown in Fig. 144 consists of a
slotted link attached by pins to a pair of eccentrics
Fig. 144.—Stephenson’s link motion
so placed on the shaft that when the latter rotated
one would move the slide valve forwards while the
other would move it backwards. The end of the
valve rod is pinned to a block which is capable of
sliding up and down in the link—or rather permits
the link to rise and fall without putting any strain
on the rod. When this link is raised or lowered by
means of a lever in the cab, one or the other eccen-
tric may be brought into operation, or by keeping