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MOTION PICTURE PROJECTION 25
STRIKING THE ARC. The act of bringing the carbons of an arc lamp together, and immediately separating them, thus establishing the arc.
SWITCH BOARD. A board to which wires are led connecting with cross bars or switches.
SWITCH, DOUBLE POLE. A heavy switch which connects and disconnects two leads simultaneously.
SWITCH, KNIFE. A switch with knife-like blades used on circuits carrying high amperage.
SWITCH, SNAP. A small switch made to give a sharp break used on home lighting circuits.
SWITCH, THREE WAY. A switch so constructed that by turning its handle, connection can be made from one lead to either of two other leads, and also so that connection can be completely cut off.
TAKE-UP (noun). The mechanism which receives and winds the film after it passes the picture aperture. Generally consists of a split pulley and tension spring, its use is to drive and control the speed and tension of the reel taking up the film in lower magazine.
TAKE-UP (verb). Winding up the film after it passes the picture aperture.
TENSION SPRINGS. On gate of machine, used to give the proper tension to film while passing aperture.
THREE WIRE SYSTEM. A system of distribution of electric current where three wires instead of two sets of two wires are used. The middle or neutral wire acts as positive wire for the negative, and as negative wire for the positive. The advantage of the system is the saving of copper.
THREE PHASE. A system of electrical distribution making use of three separate currents. These currents may be superimposed and generally only three wires are used in this transmission.
THROW. Projection distance. Distance from front combination of lens to screen.
TILT. The act of, or device for, moving a camera vertically while in use.
TINTING. Coloring a film by dyeing the gelatine side of it.
TONING. Coloring a film by chemical action on the silver image.
TRAILER. That piece of blank film attached to the end of a picture series.