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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28o
All About Engines
Small engines for launches, etc., frequently have only
a half standard, the front of the cylinders being held
up by a steel rod, a plan which reduces weight and
renders the moving parts more accessible. The shafts
Fig. 156.—Three views of a triple expansion marine engine
of marine engines are generally made hollow, and
though larger in diameter than a solid shaft of equal
strength, they are lighter. The elementary scientific
fact involved here is worth a short explanation.
In a marine engine the power is applied at one
end of a long shaft and given out at the other. As
a rule, the shaft must be long, because the engine