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124
THE SUBMARINE TORPEDO BOAT
type is advantageous in that it permits the location of
the control to be had in the most convenient place. Its
only drawback is the complexity of its construction, but
with the high voltage now handled it has become an
absolute necessity. Automatic circuit breakers of the
latest type are provided in all feeder circuits and wherever
necessary.
Storage Batteries
Although the efficiency of the motor has been greatly
advanced the problem of the storage battery still remains
one of much dissatisfaction and it is quite improbable
that the inherent defects of it will ever be overcome.
There are two distincts types of storage batteries in
general use at the present time; the first is known as the
lead battery and the second as the Edison battery.
The lead battery is the only type that has been used
aboard submarines up to the present time. I understand
however, that there is now one if not more of the boats
having the old batteries replaced by Edison cells.
The lead batteries, as their names would imply, have
active plates of lead material using sulphuric acid of a
density of about 1.23 as an electrolyte.
There are several methods of manufacturing the lead
plates, the three forms best known being the Planté
plate, the Pasted plate, and the Ironclad plate, the latter
being a particular form of the Pasted plate.
The Planté plate is manufactured with the lead made
into a fine grid which is cast, grooved, or spun in such a
way as to afford a large superficial area for the electro-
chemical action to take place upon. The grid is then
subjected to this electro-chemical process which reduces