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Handbook for the use of electricians in the operation and care of electrical machinery and apparatus of the U. S. seacoast defenses .. (1904)
United States. War Dept · Washington, Govt. print. off. · leaf 116
1 .e ] M 1 ^ K © 0 0 e V ^ B V - ^ cl !((<>. kheustat and Cunncctiuns. … ELECTRIC MOTORS. 83 The s^^tch IS moved gradually clockwise against the action of the spring andheld by the U. L. npper magnet. If the potential of supply falls off Ha %> percent, the magnet releases the armature on the switch which flies to the -Offposition where the arc, if any. is Idown-out.…Electric machinery · Searchlights · Coast defenses
Internet Archive · Library of Congress · Public Domain Mark 1.0. Free to use for anything.
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