Sal Ammoniac. 1 part
Zinc Chloride. 1 part
Manganese Dioxide. 1 part
Granulated Carbon. 1 part
Flour. 1 part
Plaster of Paris. 3 parts
Water. 2 parts
The granular carbon may be had by crushing up some old battery carbons. The parts given in both of the above formulas are proportioned so that they may be measured by bulk and not by weight. An old teaspoon or a small cup will make a good measure.
Each one of the zinc shells should be filled in this manner. After they have all been filled, clean off the top edge of the zinc and pour the remaining space in the cell full of molten tar or pitch so as to seal it over.
Solder a small binding-post to the top edge of the zinc to facilitate connection. Then wrap the cells in several thicknesses of heavy paper to prevent them from short circuiting, and they are ready for use.