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 82
Figs. 64 to 66: Various carbons; fig. 64 Cylindrical from, fig. 65 Calland star; fig. 66, wheel. Cleanliness.—In the care of batteries, cleanliness is essentialin order to secure best results. Zincs and coppers should bethoroughly cleaned every time a cell is taken out of use. Thezinc, after being…
Electrical engineering
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