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 553
-*=->■ TRAIN t-^- ±rrr mm b ;> M 14 pt.J L-teElB i R-z ; … Pigs. 3,734 to 3,737.—Diagrammatic sketches illustrating the interlocking feature of universalcrossing bell relay. Fig. 3,734 track circuit A B and B C unoccupied, bell circuit open;fig. 3,735 train has entered track circuit. A B relay magnet L. De-energized armatureL-l causes contact finger I -2…
Electrical engineering
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