American telegraphy and encyclopedia of the telegraph; systems, apparatus, operation (1909)
Maver, William, jr. [from old catalog] · New York, Maver publishing company · leaf 42
THE BURNLEY DRY CELL. DRY BATTERIES. 23 The claimed effect of the oxide of zinc upon the composition is to loosen andmake it porous, and tliat the greater porosity tlius secured facilitates the interchange ofthe gases and diminishes the tendency to polarization. The internal resistance of thecell… … FIG. 12. ZJ
Telegraph
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