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 58
s are connected andthe current commences to flow, the sulphuric acid acts on thesurface of the zinc plate and forms sulphate of zinc. The forma-tion of this new substance necessitates the liberation of someof the hydrogen contained in the sulphuric acid, and it will befound that bubbles of free… … Fig. 41.—Simple primary cell with circuit closed, showing direction of the current. Some bubbles of the gas rise to the surface of the electro-lyte and so escape into the air, but much of it clings to the surfaceof the copper element which thus gradually becomes covered with athin film of hydrogen.…
Electrical engineering
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