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 91
947 —Columbia R. S. A. sig-nal cell, type 72. It con-forms to the R. R. S. A.specifications for copperoxide, zirtc and sodaprimary battery. Thecell is self-oiling and doesnot require the shippingor handling of any oil. Aprotecting layer of oilautomatically forms onthe surface of the solutionwithin…
Electrical engineering
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