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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19° All About Engines
of the lever arms, and varies the extent of opening of
the admission valve. The same cam also serves to
open the exhaust valve, which is situated immediately
below that by
which air and
gas are ad-
mitted.
Another very
interesting
method of go-
verning is that
adopted on the
National gas
engine and
illustrated in
Fig. 113. The
cam operates
one bent lever,
and the valve
by another. Be-
ends of the two
Fig. 113.—Governing arrangement
of National gas engine
is opened
tween the
levers is a metal plate sus-
pended by a rod to a lever
which rises or falls as the
engine increases or decreases
in speed. Now the movement
of this metal plate alters the
length of one arm of the lever
which operates the valve and thus controls the amount
of opening of the valve. Both (Figs. 112 and 113)
are very pretty pieces of mechanism.