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 135
drum.—The lamp may bo lifted by the top plate,but it should never be lifted by the carbon supports, as the strain duo to itsweight is liable to spring them out of their correct position. The 18-inch andM-inch projectors have obturators which prevent carboning the lamps beforethev are placed in the… … I2S. Obturator. shutters of the obturator should be opened and the arc magnet turne<l so thatthe opening is downward. This adjustment may be made after removing thepin on the side. Tlie lamp may now be placed in the projector, the arc magnetreturned to its proper po-sition, and the shutter of…
Electric machinery · Searchlights · Coast defenses
Internet Archive · Library of Congress · Public Domain Mark 1.0. Free to use for anything.
