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 182
the knife type with metalcontacts. One manufacturer states that it is not advisable tobuild knife flashers for more than 15 amperes per double poleswitch, as they cannot be depended upon to break a greaterload for any length of time. 870 HAWKINS ELECTRICITY Simple On and Off Flashers.—These are… … Fig. 1,018.—Simple on and off double pole flasher for all on or all off sign flashing,machine is furnished with any number of switches ranging from 5 amperes up. The The machine may have only one switch or any number ofswitches. The connection to motor ma}^ be by belt or chain.or the motor may be…
Electrical engineering
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