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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7° All About Engines
Inside the firebox, just over the door, is a hood
to prevent the cold air which enters when the door
is opened from blowing directly on to the tube plate.
At this part of the boiler changes of temperature are
very undesirable, because the plate has already been
weakened by the holes bored for the tubes. A rush
of cold air through the tubes is equally to be avoided.
Fig. 36.—Double-ended marine boiler
Again, the flame from the fuel is prevented from
playing directly upon the tube plate by a firebrick
arch. These are precautions which theory shows to be
desirable, and which experience proves to be necessary.
The hood is shown in Fig. 149, and not in Fig. 33.
We can now leave the locomotive for a time and
turn to boilers for use on ships. Fig. 35 shows a
single-ended, and Fig. 36 a double-ended, marine
boiler. It will be noticed that the furnaces are