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MOTION PICTURE PROJECTION 15
BUSINESS. Action by the player; e. g., business of shutting door.
BUST. A small, magnified part of a large scene.
CABLE. An insulated electric conductor.
CAM FRICTION. The friction existing between the cam and the member connected to it.
CAMERA. An expression used to command the photographer to begin taking the scene.
CANADA BALSAM. A gum obtained from the Balsam Fir of Canada. Used for cementing lenses.
CARBON. One of the elements, existing in three forms, charcoal, graphite and diamond. It is used as electric conductor for arc lamps and incandescent lamp filaments. The carbons used for arc lamps generally have a central core of soft carbon.
CARRYING CAPACITY. The capacity of an electrical conductor to carry current without overheating.
CENTIMETER. Unit of length, 0.3937 inch.
CENTRIFUGAL FORCE. The force which draws a body constrained to move in a circular path, away from the center of rotation.
CHANGE OVER. The stopping of one projecting machine and the simultaneous starting of a second machine in order to maintain an uninterrupted picture on the screen when showing a multiple-reel story.
CHECK NUT, generally called lock-nut. A nut placed over another nut on same bolt to lock the main nut in place.
CHROMATIC. Relating to color.
CHROMATIC ABERRATION. When white light is passed through a spherical lens, both refraction and dispersion (the decomposition of white light into several kinds of light) occur. This causes a separation of the white light into the various colors and causes images to have colored edges. This effect which is most observable in condenser lenses is due to the unequal refrangibility of the simple colors.
CINE. A prefix used in description of the motion-picture
art or apparatus. CIRCUIT. The path through which the electric current
flows. CIRCUIT BREAKER. Any apparatus for opening or
closing a circuit.