Hawkins electrical guide ... : questions, answers & illustrations : a progressive course of study for engineers, electricians, students and those desiring to acquire a working knowledge of electricity and its applications ; a practical treatise (1914)
Hawkins, N. (Nehemiah), 1833-1928 · New York : T. Audel & Co. · leaf 72
Figs. 49 and 50.—American and French forms of Grenet cell. The elements are zinc andcarbon. In the Grenet cell, a zinc plate is suspended by a rod between two carbonplates, so that it does not touch them, and when the cell is not in use the zinc is withdrawnfrom the solution by raising and…
Electrical engineering
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