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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The Locomotive
265
The damper lever serves to regulate that portion of
the draught which is due to the entry of air at the
lower front end of the firebox, another part being
created by the exhaust steam. The draught through
the furnace of a locomotive when it is running at
full power is so
great that 25 per
cent, of the fuel
is thrown out of
the chimney in
the form of smoke
and fine cinders.
Looking now
at the other end
of the boiler, we
shall observe the
smokebox. In the
older engines, and
still in many of
those built to-day,
the smokebox was
comparatively
short, as in Fig.
150. The exhaust
Fig. 150.—Short smokebox
steam passes up through the blast pipe and sweeps
through the chimneys, creating, like all fluid jets,
a reduction of pressure in its neighbourhood. The
spark arrester is simply a flat plate placed in front
of the draught tubes in order to intercept small
cinders. Deprived of their velocity in this way,
they fall to the bottom of the smokebox. The wide