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), 1833-1928 · New York : T. Audel & Co. · leaf 542
d signals ? Ans. Electric locks are applied to the levers operating the manual signals. The locks are included in circuits running between block stations,and are so arranged that when an operator wishes to place a signal inthe proceed position he has first to ask (by bell signal or otherwise)for an… … OK COIL AUTOMATIC OPERATOR 1 1||||| ||||j||| CUTOUT ^KEY
Electrical engineering
Internet Archive · Brigham Young University · Public Domain Mark 1.0. Free to use for anything.
