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 305
*IG. 3,290.—Annunciator circuit for single elevator. ^IG. 3,291.—Annunciator circuit for two passenger elevators, or two freight elevators. Itshould not be used in the case of a passenger and a freight elevator. 2,396 HAWKINS ELECTRICITY … trouble is generally due to weakspring, or to the loss of brasspieces, which are inserted in theends of the cores to preventactual contact with the arma-ture. A piece of paper stuckover the ends of the cores willoften serve as a satisfactoryremedy. When the bell makes a screech-ing sound, the…
Electrical engineering
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