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 84
pping them while warm into some paraffin wax melted in 64 HAWKINS ELECTRICITY Warm oil, a precaution that should always be carried out whena dense solution of zinc sulphate is employed in the cell. Amalgamated Zinc.—To amalgamate a piece of zinc,dip it into dilute sulphuric acid to clean its… … Figs. 70 and 71.—Two forms of copper element: fig. 70, regular form for crowfoot cell;fig. 71, signal pan bottom copper. The action of the amalgamated zinc is not well understood;by some it is considered that amalgamating the zinc preventslocal currents by the amalgam mechanically covering up…
Electrical engineering
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