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24 MOTION PICTURE PROJECTION
Shutter — Intercepting Blade (also known as the flicker blade). That segment which intercepts the light one or more times during the rest or projection period of the film to eliminate flicker.
SIXTY CYCLE A. C. This is when every part of the circuit is 60 times positive and 60 times negative every second. The current changes its flow of direction 60 times a second.
SINGLE PHASE. Using only two wires and one E. M. F. sometimes called monophase or uniphase.
SINGLE PICTURE CRANK (sometimes referred to as trick spindle). That spindle and crank on a motionpicture camera which makes one exposure at each complete revolution.
SLIDE (Stereo Slide). The transparent picture from which a screen still is projected.
SLIDING FRICTION. The friction existing between two bodies in sliding contact with each other.
SPEED REGULATOR. An attachment on machine (generally a friction disc arrangement) used to regulate the speed of machine (not the speed of motor).
SPHERICAL ABERRATION. The reflected rays of concave spherical mirrors do not meet exactly at the same point. This is called spherical aberration.
SPLICING. Joining the ends of film by cementing.
SPLIT REEL. A reel having two or more picture subjects thereon.
SPOT. The illuminated area on the aperture plate of a motion-picture projector.
SPROCKET. The revolvable toothed member which engages the perforations in the film.
STAGE CABLE. A cable containing twin conductors each insulated from the other and the whole thing covered with a composition covering. Used for temporary purposes. "
STEP-DOWN TRANSFORMER. A transformer that steps
down the voltage and raises the amperage. STEP-UP TRANSFORMER. A transformer that steps
up the voltage and lowers the amperage. STEREOPTICON. A lantern for projecting transparent
pictures, i. e., lantern slides, often a double lantern for
dissolving. STILL. A picture from a single negative.