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- · New York, T. Audel · leaf 195
grams of metal compartments so arranged that any figurema<r be produced by lighting the proper combination of lamps. SIGN FLASHERS 883 the switch and call are connected together, any numeral may beflashed by pressing the corresponding key. The numeral auto-matically remains lighted until the… … -TO LAMP GROUP NP 1 TO LAMP GROUP N? Z~ Fig. 1,038.—Two way thermal flasher. The moving portion consists of a rocking arm Apivoted at p, and carrying two sealed bulbs, B, B, whose bottoms are united by thetube T. Inside there is sufficient mercury AI to fill T and the bottoms of the bulbs,…
Electrical engineering
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