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 258
Contact maker short circuits the current; 4. Magnet looses practically all of its magnetism; 5. Momentum acquired by moving element causes hammer to strike bell; 6. Tension of the hammer spring overcomes weak magnetism of magnetsand pulls armature away from magnet; 7. Near end of outward swing,… … Fig. 3,208.—Partrick and Wilkins emergency gong. It operates single stroke by hand, andvibrating by battery; used by hand in emergency in giving alarms or signals. Thisstyle of bell is used for school house work. Ques. For what conditions of operation is the shuntbell suitable, and why? Ans. It is…
Electrical engineering
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