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 184
fact that there are three parts of light to one of darkness. more than two-thirds of the lamps are turned on at one time,and this number for only about one-sixth of the time, as com-pared with the sign burning steadily. Lightning strokes can be utilized in various ways, either aloneor with other… … Fig. 1,020—Wiring diagram for flags. These may be wired for high speed flashers by graduallyincreasing the lamp centers between the vertical rows from the flag staff to the end. RETURN OR NEUTRAL WIRE 1 6z 6i 64 (J)i (j)2 63 6a 6\ 62 61 64 61 6z 61 1 r ■ —p Z 3 4 TO FLASHER Fig. 1,021.—Diagram…
Electrical engineering
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