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MANAGERS AND PROJECTIONISTS 23
CANDLE FOOT OR FOOT CANDLE.— A unit of illumination, being the light given by a British standard candle at one foot distance. It is equal to 10764 candle meters, which see.
CANDLE METER.— A unit of illumination, being the illumination of a standard candle at the distance of one meter.
CANDLE, STANDARD.— The standard candle by which all lights are measured is legally held to be a sperm candle consuming 120 grains of wax per hour. In practice standardized incandescent lamps are more reliable. The standard unit of candle power established by the National Bureau of Standards at Washington equals 100/80ths of the Hefner unit under Reichsanstalt standard condition.
CARBON ARC. — A voltaic arc occurring between carbon points, as in an arc lamp.
CARBON BRUSHES.— Commutator brushes made from carbon, sometimes coated with copper to insure better electrical contact with holders.
CARBON ELECTRODES.— The carbons used in an arc lamp.
CARBON JAW. — The jaw of an arc lamp by means of which the carbons are gripped and held.
CARBONS. — The carbon rods or pencils used in an arc lamp.
CARRYING CAPACITY.— Greatest number of amperes an electrical conductor can safely carry.
CARTRIDGE FUSE.— See page 109.
CATHODE. — In projection the lower, mercury, contact of a mercury arc rectifier tube or bulb.
CELLULOID. — A hard, flexible substance formed by dissolving camphor in alcohol and adding pyroxylin. The resultant mass is incorporated between rollers.
CEMENT, FILM. — A cement, or chemical solvent, by means of which two pieces of film may be joined or spliced together. All film cements are volatile, therefore must be kept tightly corked when not in use.
CEMENT LINED CONDUIT.— Conduit having its interior surface coated with cement.
CENTER LENS.— The lens between the collecting and converging lenses in a 3-lens condenser combination.
CHANGE-OVER.— In projection, the act of changing from one projector to another without interrupting the continuity of action upon the screen.