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 318
of the box four times. Once starting, the alarm cannot be interfered with.By means of a special key the circuit and mechanism may be tested or a single round ofthe box sent in as a watchmans signal without disturbing the glass or interfering with theregular fire alarm setting of the box. The inner… … Figs. 3,319 to 3,322.—Milonite nails and method of tacking two insulated wires. The headsare colored to match insulation and the wires can be taken down without cutting orinjuring the insulation. 2,410 HAWKINS ELECTRICITY Ques. What provision is made to preserve the con-tinuity of the circuit…
Electrical engineering
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