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THE POWER PLANT
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sible by using an improved form of oil burning boiler to
secure an economy as low as .7 to .8 of a pound of fuel
per B.H.P. per hour. This is but little in excess of the
Diesel engine consumption, and by using the steam
900 B.H.P. Italian Sumbarine Engine. Two 4 cylinder engines
arranged tandem
engine the attendant improvement in conditions would be
manifold. The weight for the steam plant for the same
power of Diesel plant would be much less. The mean
effective pressure is higher in the steam unit and its cyl-
inders are subjected to but little more than one-fourth of
the extreme pressure and not to one-fourth of the extreme
temperature of the Diesel unit. The steam unit is also the
more simple and the more easily accessible of the two.
The ideal form of power plant for the submarine, as
may be easily understood, is one that is capable of oper-
ation both when on the surface and when in the sub-
merged condition, that is, in other words, a single unit
which will do away with the present dual system. The
problem then is to find some method by which the prime