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40 amperes adjustment alternating current amperage angle arc lamp armature asbestos attached binding post brush carbon carrying casting circuit clamp clean coil commutator compensarc connected copper cored crater diameter direct current distance drive edge effect electrical fact feet Figure film Film gate fire shutter flow focus frame friction front fuses gear glass grids holder hole idler inch increased installed insulation intermittent sprocket lamp lamphouse length lenses less lever light rays located loosen lower sprocket magnet means mechanism mercury arc rectifier metal motor moving picture necessary objective lens ohms operating room pipe position practice projection arc projection machine projector pull reactance reel remove resistance rheostat screen set screw shaft shown side slide speed spherical aberration spindle spring stereopticon supply surface switch switchboard take-up temperature tension theatre thing tion transformer voltage volts wall wheel wire
Page 67 - SWITCHBOARDS — a. Must be so placed as to reduce to a minimum the danger of communicating fire to adjacent combustible material.
Page 67 - Must be so placed as to reduce to a minimum the danger of communicating fire to adjacent combustible material. b. Must be accessible from all sides when the connections are on the back ; or may be placed against a brick or stone wall when the wiring is entirely on the face. c. Must be kept free from moisture. d. Must be made of non.combustible material, or of hard wood in skeleton form, filled to prevent absorption of moisture. e.
Page 53 - ... then the voltage increased by steps of not over 3,000 volts, each held for five minutes, until the rupture of the insulation occurs. The tests for dielectric strength shall be made on a sample of wire which has been immersed in water for seventy-two hours. One foot of the wire under test is to be submerged in a conducting liquid...
Page 68 - SWITCHBOARDS. If the wiring is on the back, there must be a clear space of at least eighteen inches between the wall and the apparatus on the board, and even if the wiring is entirely on the face, it is much better to have the board set out from the wall. A clearance of at least 1 ft. 6 in. between the wall and the furthest extending apparatus on the back of the switchboard is required for boards which have wiring on their backs. This 1 ft. 6 in. is the minimum clearance permissible. It is customary...
Page 68 - ... on the face. / If the wiring is on the back, there must be a clear space of at least eighteen inches between the wall and the apparatus on the board, and even if the wiring is entirely on the face, it is much better to have the board set out from the wall. d. Must be kept free from moisture. e. Wires with inflammable outer braiding, when brought close together, as in the rear of switchboards, must, when required, be each surrounded with a tight, non-combustible outer cover. Flame proofing must...
Page 67 - Switchboards. a. Must be so placed as to reduce to a minimum the danger of communicating fire to adjacent combustible material. Switchboards must not be built up to the ceiling, a space of three feet being left, if possible, between the ceiling and the board. The space back of the board must be kept clear of rubbish and not used for storage purposes.
Page 81 - York, and of the board of water supply of the city of New York, are complied with, and shall make such regular or special inspections as the state commissioner of health or the commissioner of the department of water supply, gas and electricity of the city of New York, or the board of water supply of the city of New York, may prescribe.
Page 428 - THE mercury arc rectifier is a device marketed by two manufacturers, the General Electric Company and the Westinghouse Electric and Manufacturing Company, for...