History, theory, and practice of the electric telegraph (1866)
Prescott, George B.(George Bartlett),1830-1894 · Boston, Ticknor and Fields · leaf 47
Fig. 6. in this state these substances have the advantage of being suffi-ciently porous to permit communication between the liquids, andat the same time of entirely preventing their mixture. … Rg. 7. In Groves battery (Fig. 7) the pairs are generally of a cylin-drical form; they are cylinders of zinc (Fig. 8) and plates of PROPAGATION OF ELECTRICITY. 29 platinum plunged into cups of porcelain or glass. Each cell con-tains dilute sulphuric acid, in which the zinc is immersed, and asmall…
Telegraph
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