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 308
FIGS. 3,296 to 3,800,—Saddled staples for securing bell wires. … Fig. 3,301.—Roll of insulating tape for covering the joints of bell wire. Waterproof saddled staples have a double thickness of insulatingmaterial protecting the metal and preventing it cutting through thewire. Insulating pin tacks are sometimes used where twisted wire isto be tacked. These fibre…
Electrical engineering
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