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 192
Pig. 1.032.—Monogram or unit for carriage call or talking sign. It consists of a collectioo ofmetal compartments each arranged to receive an incandescent lamp. The purpose ofthese compartments is to confine the light to a certain space, thu^forming a dearly definednumber or letter which can be read… … Fig. 1,033 and 1,034.—Wiring diagrams showing proper methods of wiring for illnniinating apainted sign. The lamps are placed about one foot apart in an overhead inverted trough.They should project out in front of the sign one-half its width, but no sign should bemore than eight feet wide, as…
Electrical engineering
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