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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James Watt: The Man and his Work 53
through a rope or chain lying over a circular arc in
order that the force might always act at right angles
to a line joining it with the centre of the beam. If
only a pin joint had been used between the piston rod
and the beam
the former would
have been bent
backwards and
forwards at every
stroke; but the
flexible connec-
tion was no use
when the piston
rod had to make
both a pull and
a push, and
Watt had to de-
vise a more rigid
method of com-
municating the
motion.
The form
adopted is shown
in Fig. 20, and the reader may amuse himself again
by making a model in card or thin wood. All that
needs to be said is that a and c are fixed points,
a representing the centre of the beam and c being
on the wall of the engine house; and that the end
of the piston rod is pinned to the frame at b. All
the other joints are free.
While the double-acting cylinder, aided by the