M.F. of two volts. In order to have a constant power of one
horse for 71/2 hours, at the rate of 40 amperes discharge, we must have
more than nine cells per electrical horsepower; and 47 such cells will
supply five electrical horse power for the time stated, and these 47
cells will weigh 2,633 lb.
We could employ half the number of cells by using them at the rate of
80 amperes, but then they will supply the power for less than half the
time. The fact, however, that the cells will give so high a rate of
discharge for a few hours is, in itself, important, since we are enabled
to apply great power if desirable; the 47 cells above referred to can
be made to give 10 or 12 electrical horse power for over two hours, and
thus propel the boat at a very high speed, provided that the motor is
adapted to utilize such powerful currents.
The above mentioned weight of battery power--viz., 2,632 lb., to
which has to be added the weight of the motor and the various
fittings--represents, in the case of a steam launch, the weight of
coals, steam boiler, engine, and fittings.
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