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22 MOTION PICTURE PROJECTION
PRE-RELEASE. A picture not yet released for public showing.
PRESSURE, ELECTRIC. Electric motive force, voltage.
PRIMARY COIL. The coil of a transformer, connected
to the source of electrical supply. PRIMARY COLORS. Red, yellow, blue. PRIMARY POWERS. Water power, wind power, tide
power, power of combustion, power of vital action. PRINT. Same as "positive." PRODUCER. The maker of photoplays. PROGRAM. The complete show for a single optience. PROJECTION DISTANCE. The distance between the
screen and the objective of a stereopticon lantern or
motion-picture projecting machine. PROJECTION LENS. Properly called projection objective. PROJECTION OBJECTIVE. The objective which forms
an image of the lantern slide or film, upon the screen PROPS. Contraction of properties. Objects used as
accessories in a play. RACING OF MOTORS. The rapid acceleration of speed
of a motor when the load upon it is removed. REEL. An arbitrary unit of linear measure for film —
approximately a thousand feet. REEL. The metal spool upon which the film is wound. REFLECTION. The change of direction experienced by
a ray of light when it strikes a surface and is thrown
back or reflected. Light is reflected according to two
laws.
(a) The angle of reflection is equal to the angle of incidence.
(b) The incident and the reflected rays are both in the same plane which is perpendicular to the reflecting surface.
REFRACTION. The change of direction which a ray of light undergoes upon entering obliquely a medium of different density from that through which it has been passing. In this case the following laws obtain:
(a) Light is refracted whenever it passes obliquely from one medium to another of different optical density.
(b) The index of refraction for a given substance is a constant quantity whatever be the angle of incidence.