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THE POWER PLANT 131
A boat of this type has been built in France and the
process has also been tried out in Germany, but it is
not believed that any great success was obtained on the
trials. The principle of this system is old, having first
been tried out in this country by Prof. J. H. L. Tuck of
San Francisco in his submarine boat Peacemaker, in
I believe 1885. The boat was built by the Submarine
Motor Co. of New York, and tried out up the Hudson
River before a United States Naval Board. The same
principle has since been laid before the Navy Depart-
ment by a Chilian inventor, and it has also been worked
upon by several European engineers.
Another system of propulsion has lately been perfected
under patents held by the L. A. Submarine Boat Co. of
California, now the Neff System of Submarine Propulsion,
which provides means for utilizing the same power unit
both when on the surface and when submerged. This
system which has been developed by the author, con-
templates the use of the main engines to accomplish this
result, and it is claimed that any form of prime mover
may be used with satisfactory results. A boat with the
system installed has been built and put through trials
under inspection by a Naval Board and the results were
found to be satisfactory in every way. By means of the
equipment both greatly increased submerged speed and
increased radius of action submerged were shown. The
military advantages of these two factors would appear to
be of prime importance.
At present it is rather much of a question to say what
new turn the power plant for a submarine will take. It is
highly probable though, that if the Diesel engine is re-
tained it will be of the non-reversible type, of heavier