I have now to draw your attention to a new motor of my own invention, of
the weight of 124 lb., which, at 1,550 revolutions, gives 31 amperes and
61.5 volts at terminals. The mechanical horse power is 1.37, and the
coefficient 373.
Ohms.
Armature resistance 0.4 w.
Field-magnet resistance 0.17 w.
Insulation resistance 1,500,000 w.
This motor was only completed on the morning before reading the paper;
it could not, therefore, be tested as to its various capacities.
We have next to consider the principle of applying the motive power to
the propulsion of a launch. The propellers hitherto practically applied
in steam navigation are the paddle-wheel and the screw. The experience
of modern steam navigation points to the exclusive use and advantage of
the screw propeller where great speed of shaft is obtainable, and the
electric engine is pre-eminently a high-speed engine, consequently the
screw appears to be most suitable to the requirements of electric boats.
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