** How to Make a Small Storage Battery [121]
The cell of a storage battery consists of two plates, a positive
and a negative, made of lead and placed in a dilute solution of
sulphuric acid. Large batteries made of large cells have a great
number of plates, both positive and negative, of which all
positive plates are connected to one terminal and the negative
plates to the other terminal. The storage cell, as described
below, is the right size to be charged by a few gravity cells and
is easily made.
Secure a piece of 1-3/4-in. lead pipe, 5 in. long, and cut both
ends smooth and square with the pipe. Solder a circular disk of
lead to one end, forming a cup of the pipe. As this cup must hold
the sulphuric acid it must be perfectly liquid-tight. It is also
necessary to get another lead pipe of the same length but only
3/4-in. in diameter. In this pipe should be bored as many 1/8-in.
holes
[Illustration: Battery]
as possible, except for about 1 in. on each end. One end of this
tube is hammered together as shown at A in the sketch to make a
pocket to hold the paste. This, of course, does not need to be
watertight.
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