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MOTION PICTURE PROJECTION 27
MOTION PICTURE STANDARDS
The following have been adopted as standards by the Society of Motion-Picture Engineers, and are 'promulgated to encourage uniformity and standard practice throughout the Industry as a whole. Their early universal adoption will save the industry a great deal of present annoyance and monetary loss.
FILM SPEED. A film movement of sixty feet per minute through mo£ion-picture mechanisms shall be considered as standard speed.
FRAME LINE. The dividing line between pictures on motion-picture film shall lie exactly midway between the marginal perforations.
INTERMITTENT GEAR RATIO. The movement of the intermittent gear shall be expressed in degrees of rotation during which the pin of the driver is in contact with the slot of the driven gear. For example, a gear in which the pin is engaged with the slot for one-quarter of a revolution of the driver shall be called a 90-degree movement; that in which the pin is engaged with the slot for one-sixth of a revolution shall be called a 60-degree movement, etc.
LANTERN SLIDE MAT OPENING. A standard opening in mats of lantern slides for use in conjunction with motion pictures shall be 3 inches wide by 21/4 inches high.
THUMB MARK. The thumb mark spot on a lantern slide shall be located in the lower left-hand corner next the reader when the slide is held so as to be read against a light.
LANTERN STRIP. A red binding strip to be used on the lower edge of the lantern slide.
PICTURE APERTURE. The standard film picture aperture in a projecting machine shall be 0.906 inch wide and 0.6795 inch high, namely, 29/32" and 87/128".
PROJECTION ANGLE. The maximum permissible angle in picture projection shall not exceed twelve degrees (12 ) from a perpendicular to the screen surface.