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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I04 All About Engines
There are many inventions described as mar-
vellous which are not half so wonderful. Everybody
has heard of the boa-constrictor, which began to
swallow itself, starting at the tail, and has exer-
cised his imagination to picture what would happen
when it got to the middle. But by means of the
injector the boiler actually performs the feat. The
clack valve is the mouth and the steam is the tail;
and the tail continually lengthens out as it is swal-
lowed up, taking a considerable quantity of water
with it.
Now, having seen how steam is raised with due
regard to safety and economy, and traced it from
the boiler to the engine in which its energy is to be
converted into useful work, we are ready to consider
the details of those modern reciprocating engines by
which the machinery of the world’s workshops is
driven.