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 125
then backed up with electrotype metal torender it strong enough for use. Almost all the illustrations in this book, for example, areprinted from electrotype copies, and not from the original woodblocks, which would not wear so well. MAGNETISM 105 CHAPTER IX MAGNETISM Magnetism.—The ancients applied… … Fig. 93. — Simple compass. It consists of a magnetic needle resting on a steel pivot, protectedby a brass case covered with glass, and a graduated circle marked with the letters N, E,S, W, to indicate the cardinal points; a b is a lever which arrests the needle by pushing itagainst the glass when…
Electrical engineering
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