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MOTION PICTURE PROJECTION 19
FUSING POINT. The temperature at which metals melt and become liquid.
GENERATOR. An apparatus for maintaining an electrical current.
GOVERNOR MOVEMENT. The movement that works the automatic shutter, works by centrifugal force.
GRAPHITE. A soft form of carbon, used as a lubricant.
GROUND. The contact of an electrical conductor with the earth, or with some other conductor not in the circuit.
HORSE POWER. A unit of rate of work. Equal to the raising of 33,000 pounds, .one foot in one minute; equal to 746 watts.
INDUCTION. The property of a charged body on A. C. to charge a neighboring body running parallel to it without any tangible form of connection.
INDUCTOR. A step-down transformer.
IMPEDANCE. Is to an A. C. circuit what resistance is to a D. C. circuit.
INSULATING TAPE. A prepared tape to cover the ends
of bared wire. INTERMITTENT MOVEMENT. The movement that
drives the intermittent sprocket, generally a four-to-one
movement. INTERMITTENT SPROCKET. The sprocket which engages the film to give it intermittent movement at the
picture aperture. INSERT. Any photographic matter, without action, in
the film. INTERIOR. Any scene supposed to be taken inside a
building. IRIS. An adjustable lens diaphragm. IRISING. Gradually narrowing the field of vision by a
mechanical device on the camera. JOINING. Splicing into a continuous strip (usually 1,000
feet) the separate scenes, titles, etc., of a picture. KILOWATT. Equal to 1,000 watts. LAMINATED. Made up of a number of thin sheets. LANTERN PICTURE. A still picture projected on a
screen by means of an optical lantern or stereopticon. LANTERN SLIDE (see slide). The transparent picture
from which a lantern picture is projected.