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 557
n by the next car and the repair men at the barn make thenecessary repairs. There are, however, many small roads where a knowledge of how toremedy trouble is needed, and even on the large roads, the man whounderstands his car can save many delays if he know how to intel-ligently report troubles. In… … Fig. 3,743.—Standard home and distant semaphore signals. In operation, until either bladehas reached a position approximately 30 degrees from the vertical it will indicate the sameas though at the full horizontal position. This is effected by using several spectacles,each held in place by…
Electrical engineering
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