History, theory, and practice of the electric telegraph (1866)
Prescott, George B.(George Bartlett),1830-1894 · Boston, Ticknor and Fields · leaf 46
Fig. 4. PROPAGATION OF ELECTRICITY. 27 upon some lines for working main circuits. The following form(Fig. 5) was designed by Messrs. C. T. & J. N. Chester, of New … qMPj|j|g|Pg|j0|0|g|P| iiiirn.iii Fig. 5. York, especially for local circuits upon telegraph lines. Z is acylinder of zinc ; PC, porous, or unglazed earthen cup ; C, cop-per cell, with perforated copper chamber attached; G, glass tum-bler. This form of the Daniell battery, and that represented…
Telegraph
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