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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How a Modern Engine Works 17
cut out of thin wood or stiff card and fastened to a
board m the positions shown by tacks or drawing
pins, a is a piece of card or thin wood upon which
a piston and rod have been drawn, and a strip of
wood or card b, representing the connecting rod,
connects it with the circular disc c representing the
crank or crank disc. For these joints a drawing pin
with its point upwards is convenient, and the point
Fig. 11. Model for study of valve motion
can be rendered less dangerous by a piece of cork.
d, again, is a piece upon which the valve is drawn,
and it is similarly connected with a smaller disc f
through a connecting rod e. The parts a and d
are free to slide backwards and forwards on the
board. It is a good plan to mount the discs c and
f on small wood pulleys connected by a rubber ring
so that they both rotate at the same speeds, and
piston and valve move together.
c