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 546
hore arms of distant signals have notched ends while thehome signals have straight ends. When a home semaphore signal is upit means to stop; danger ahead. When a distant semaphore signal isup it means to proceed with caution and the next home station signalwill indicate if the block be clear.… … Pigs. 3,724 to 3,726.—Diagrams showing operation of three position universal annunciator.Fig. 3,724, normal position: card displaying clear, local bell contacts open; fig. 3,725,train in circuit position: card showing train, local bell contacts closed; fig. 3,726, restoredposition—showing red…
Electrical engineering
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