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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Raising Steam 61
fast! The only thing that could be done was to
turn the hosepipe on him. Under the douche of cold
water he shrank sufficiently to be pulled through.
Men who are built for “ comfort rather than speed ”
are not very well suited for boiler inspection and
scaling.
In order that a boiler may produce the largest
quantity of steam from the smallest weight of fuel,
it must be so designed that:
(a) The fire burns regularly and fiercely.
(b) There is a large area of surface in contact
with the fire or hot gases on one side
and water on the other ; and
(c) The water should circulate rapidly from the
hotter parts of the boiler, near the fire,
to the cooler parts, remote from it.
Let us now see how these results are attained.
Common Types of Boiler
In the days of James
Watt the favourite type of
boiler was the “ Wagon,”
shown in Fig. 25. The boiler
rested on brick walls with
the grate between, and it
was only expected to stand a
pressure of, say, 10 lb. on the
Fig. 25.-W.tt’. wajM boiler square Thg strength of
this type of boiler was increased by making it cylin-
drical, and the heating surface by fitting tubes from
end to end, which conveyed the hot gases from the