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MANAGERS AND PROJECTIONISTS 39
PROJECTION SPEED, NORMAL.— Normal speed of projection as fixed by the Society of Motion Picture Engineers is 60 feet of film a minute.
PROJECTION SPEED, PROPER.— The proper projection speed is a speed exactly equal to the camera speed at which any individual scene was taken.
PROJECTION LAMP.— An arc lamp provided with adjustments necessary to maintain the light source in correct relation to the optical train of the projector.
PROJECTIONIST.— A person who makes the projection of motion pictures his or her profession, trade or business. More particularly the title is applied to ambitious, energetic men of recognized ability in both practical projection and in technical knowledge as applied thereto.
PROJECTOR, MOTION PICTURE.— A combination of a light source, its housing, an optical train and a mechanism and a supporting base, with the necessary means for adjustment of the various elements with relation to each other, the whole being used for the projection of motion pictures.
PROJECTOR MOTOR SWITCH.— The switch attached to a projector by means of which the circuit operating its driving motor is opened or closed.
PROJECTOR TABLE SWITCH.— The switch attached to the projector by means of which the projector light source circuit is opened or closed.
PUSH BUTTON.— A single pole contact switch for low voltage circuits which is operated by pushing a button.
QUICK BREAK SWITCH.— A switch operated by a spring in such way that the contact is broken instantaneously.
QUIET ARC. — An electric arc which is noiseless in operation.
RACING. — As applies to a motor or dynamo, the acceleration of speed which occurs when the machine is suddenly relieved of its load.
RADIUS. — A straight line drawn from the center of a circle to any part of its circumference. The distance from the center of a circle to its circumference. Half the diameter of a circle.
RAIN. — Scratches in film which when filled with dirt become semi-opaque and have the appearance of "rain" in the projected picture.
RATIO OF INTERMITTENT MOVEMENT.— The ratio of the time the intermittent sprocket is in movement to the time it is at rest during each cycle of the intermittent movement