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118 THE SUBMARINE TORPEDO BOAT
a thick cylinder exposed to high temperature and to
high inside pressure as well will be actually stressed more
than a thinner one. It is also a known fact that cast iron
2 Stroke Cycle Southwark-Harris Diesel Type Engine
appreciably changes its form and dimensions when sub-
mitted to continuous high temperatures and develops a
state of high internal compression as it tends to expand.
This tension is too unevenly distributed throughout the
metal on account of the cooler outer surface, thus accen-
tuating the detrimental effects upon the metal. The
answer to this difficulty seems therefore to be one of metal-