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CELLS AND BATTERIES 61

as it is desired to make cells. Also cut out an equal number
of circles 2% inches in diameter.

Roll the sheets up into cylinders 2% inches in diameter
inside and 6 inches long. The edges are lapped and sol-
dered. Fit one of the round circles in one end of each of the
cylinders and solder them securely into place, taking care
to close up all seams or joints which might permit the elec-
trolyte to escape or evaporate.

Secure some old carbon rods or plates by breaking open
some old'dry cells. The carbons will be in the form of a
flat plate, a round rod, or a star-shaped corrugated rod, de-
pending upon the manufacture of the cell. Any of these
types of carbons will serve the purpose well, provided that
they are fitted with a thumb-screw or a small bolt and nut
at the top so as to make wire connections with the carbon.

Make a wooden plunger of the same shape as the carbon
which you may select, but make it slightly larger. Smooth
it with sandpaper and give it a coat of shellac to prevent it
from absorbing moisture.

This wooden plunger is temporarily inserted in the center
of one of the zinc cups and supported'so that it will be about
one-half inch above the bottom.

The electrolyte is prepared by mixing together the follow-
ing ingredients in the proportions shown:

Sal Ammoniac ............................ 1 part
Zinc Chloride ............................. 1 part
Plaster of Paris ........................... 3 parts
Flour .................................... % part

Water ................................... 2 parts

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