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14 MOTION PICTURE PROJECTION
ASBESTOS. A fibrous variety of ferro-magnesium silicate; is a non-conductor of heat and fireproof.
ASBESTOS COVERED WIRE. A cable containing very fine strands of copper wire all twisted together and covered with an asbestos covering. Used wherever heat is generated. On motion picture circuits used between the table switch and arc lamp.
AUTOMATIC. Self acting.
AUTOMATIC SHUTTER. The shutter covering the film aperture in gate of machine and controlled by the centrifugal or governor movement, is so arranged that the shutter will remain up so long as the machine L in motion, but should the machine stop for any reason then the shutter falls and cuts off the rays of light from the film in gate. (A fire prevention device.)
AUTO TRANSFORMER. A transformer provided with only one coil instead of two. Part of the coil being traversed by the primary circuit and part being traversed by the secondary circuit.
B. & S. W. G. Abbreviation for Brown & Sharpe Wire Gauge.
B. W. G. Abbreviation for Birmingham Wire Gauge.
B. X. Metal tubing containing two conductors, each conductor insulated from the other by a rubber covering, and both wires wrapped with a composition covering so as to completely fill the tubing.
BABBITT METAL. An anti-friction metal.
BACK FOCUS. Properly called working distance.
BACK FOCAL LENGTH OF LENS. The distance from the back of the lens to the film in the gate, while the film image is in focus on the screen.
BALANCE WHEEL. A fly wheel. A wheel added to machinery for the purpose of preventing too sudden variations in speed.
BALL & SOCKET JOINT. A joint in which a spherical object is placed within a socket made to fit it.
BALL BEARING. A bearing whose journal works upon a number of metal balls. Used to reduce friction to a minimum.
BED PIECE. The frame carrying the dynamo or motor.
BORE, The interior diameter of a cylinder.
BRUSH. A rod of carbon held in a holder and pressed against the commutator.