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20 MOTION PICTURE PROJECTION
LEADERS. That piece of blank film attached to the beginning of the picture series.
LENS. A lens may be denned as a piece of glass or other transparent substance with one or both sides curved. Both sides may be curved, or one curved and other flat! The object of the lens is to change the direction of rays of light and thus magnify objects or otherwise modify vision.
Lenses may be classed as:
Double convex Double concave
Piano convex Piano concave
Concavo convex Convexo concave
The focus of a lens is the point where the refracted
rays meet.
LIGHT BEAM. A bundle of light rays.
LIGHT RAY. A thin line of light.
LOCATION. Any place selected for the action of an outdoor scene.
LOST MOTION. Motion in a part of machine that produces no useful results.
LUBRICANT. An oil used to diminish friction in the working parts of machinery.
LUG. A wire terminal.
MAGAZINE VALVE. The film opening in the magazine of a motion-picture projector.
MAN POWER. Equal to one-tenth of a horse power.
MASKS. Opaque plates of various sizes and shapes used in the camera to protect parts of the negative from exposure.
MICA. A mineral more or less transparent and used for insulating.
MIL. Unit of length.
MIL, CIRCULAR. Unit of area.
MOTION-PICTURE. The synthesis of a series of related picture elements, usually of an object in motion.
MOTION-PICTURE FILM. The ribbon upon which the series of related picture elements is recorded.
MOTION-PICTURE PROJECTOR. An optical lantern equipped with mechanisms for suitably moving motionpicture film across the projected light.
MOTOR GENERATOR. A motor connected to a generator.