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MANAGERS AND PROJECTIONISTS 47
steady speed, may revolve at differential speed, gradually slowing up as the film roll increases in size.
TENSION SHOES.— Metal bars upon which the tension springs bear which themselves bear directly on the film and provide braking friction to stop film over aperture.
TENSION SPRINGS.— The springs which provide braking action to stop the film over the aperture at the completion of the intermittent movement.
THREE-PHASE.— See page 18.
THREE-WIRE CIRCUIT.— A circuit in which all three wires o«f a three-wire system are used.
THROW.— See "Projection Distance."
THREE-WIRE SYSTEM.— See page 85.
THUMB MARK.— A mark on the lower left hand corner of a stereo slide when the slide is held so as to be read against the light. Thumb mark is on the face (cover glass) side of the slide.
TORQUE. — The pulling force which tends to rotate, as the rotating of a motor armature.
TRAILER. — A short length of opaque film attached to the end of a reel of film so that projection may proceed up to the end of the film proper without showing white light upon the screen.
TRANSFORMER.— A device for transforming A. C. of high voltage to a lower voltage and increased amperage, or vice versa. See page 544.
TRAVELING ARC.— An unsteady arc, particularly one in which the point of highest illumination in the crater moves about, usually due to faulty carbons.
TRIPLE POLE, SINGLE THROW (T. P. S. T.) SWITCH. — A knife switch with three blades, but which makes and breaks on one set of contacts only.
TWO-PHASE CURRENT.— See page 18.
TWO-PHASE MOTOR.— An induction motor which, instead of having a single field winding, has two separate windings, each taking current from a single phase circuit of the same frequency, but differing in phase by one-quarter of a period. A motor made to operate on two-phase lines.
TWO-PHASE SYSTEM.— A system supplied with two alternating currents of the same frequency, but differing in phase by a quarter of a period. It may be supplied by two separate two-wire circuits, or by a three-wire system in which one wire is common to the two currents.