Miller, Kempster Blanchard, 1870-1933 · New York : McGraw publishing company · leaf 109
cases where thecircuit will be closed for a few minutes at a time; and this is exactlythe condition met in telephony. The cell shown in Fig. 65 was once widely used by the Bellcompanies, one cell with each Blake transmitter. The zinc elec-trode is in the form of a rod, while the carbon electrode is… … FIG. 65.—THE LECLANCHE CELL. to give greater conductivity to the mixture and a greater surface tothe carbon electrode. A cell using practically the same materials for its various parts,but dispensing with the porous cup of clay, is shown in Figs. 66and 67, the latter being a sectional view. The…
Telephone
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