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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202
All About Engines
has defied solution. There is, however, one inven-
tion which deserves description by reason of its sim-
plicity, its originality, and its success. And that is
The Explosion Pump
The explosion pump was invented by Mr. H. A.
Humphrey, who was one of the pioneers of the large
gas engine in Great Britain. Suppose a large U-tube
open at both ends, as in Fig. 115, to be filled with
water or any other liquid, and suppose pressure to be
Fig. 115.—Diagram to explain principle of
Humphrey pump
suddenly applied
to the surface of
the water in the
left-hand limb.
The liquid will
fall in that limb
and rise in the
other, and as
soon as the pres-
sure is released
it will flow back past its original level until it rises
nearly as high in the left-hand limb as it reached,
under pressure, in the right. But it will not stop
there. It will swing again in the direction in which
it was originally driven, and then back, several times,
the swing gradually decreasing in extent until the
liquid comes to rest. The internal friction of the
liquid, the friction on the walls of the tube, and
the work done each time in pushing back the
atmosphere gradually destroy the motion.
Now this swing or vibration, or oscillation, is