A box of wood is made to hold the larger tube or cup. This box can
be square, and the corners left open around the cup can be filled
with sawdust. A support is now made from a block of wood to hold
the tube, B, in place and to keep it from touching the cup C. This
support or block, D, is cut circular with the same diameter as the
lead cup C. The lower portion of the block is cut away so it will
just fit inside of the cup to form a stopper. The center of this
block is now bored to make a hole the same size as the smaller
lead pipe. Place the lead pipe in the hole and immerse it in
smoking hot paraffine wax, and leave it until the wood has become
thoroughly saturated with the hot wax. Use care to keep the wax
from running on the lead at any place other than the end within
the wood block. Two binding-posts should be attached, one to the
positive, or tube B, and the other to the negative, or tube C, by
soldering the joint.
A paste for the positive plate is made from 1 part sulphuric acid
and 1 part water with a sufficient amount of red lead added to
make of thick dry consistency. When mixing the acid and water, be
sure to add the acid to the water and not the water to the acid.
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