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 193
olors, only red and amber should be used. Xo other oolor$, su(;i» as freen.blue, etc., will give sufficient light to produce a good effect. SIGN FLASHERS 881 The call itself consists of two or more sheet steel boxes, oneof which is shown in fig. 1,032, with incandescent lamps ar-ranged in metal… … Fig. 1.0.J.i.—Operating keyboard for three number National carriage call. The keyboard hereshown is designed to control a three number call, there being a row of keys for each mono-gram or unit of the call. Its dimensions are 4 inches deep. 18 inches wide and 19 mcheslong. The base is of slate.…
Electrical engineering
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