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 251
tary bells are intended to illus-trate principles, metallic circuits being shown for simplicity. It should be noted that in con-struction, the metal frame of the bell is used as a ground or return instead of a separate wire. 2,342 HAWKINS ELECTRICITY Ques. What is the object of the contact breaker… … Pig. 3,202.—Bunnell vibrating bell. It has a skeleton type frame, pivoted armature, castgong, and platinum contacts. Made in sizes 2% inch to 12 inch. Proportion of Parts.—The table given on the next page con-veys a general idea of the proportions which should be adopted inthe construction of bells…
Electrical engineering
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