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
2,746 HAWKINS ELECTRICITY 5. Weak dry cells can be strengthened by removing the paper jacketand punching the metal caps full of small hole, then placing in a weaksolution of sal-ammoniac, allowing the cells to absorb all they will takeup. Do this only in emergency; if the holes be closed by…
Electrical engineering
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