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MANAGERS AND PROJECTIONISTS 41
RELIEF PROJECTIONIST.— The projectionist who works a short shift to relieve the regular projectionist during meal times or for some other purpose.
REMOTE CONTROL.— The control of apparatus from a point some distance removed therefrom, as, for instance, a motor generator located in a basement may be started, stopped and controlled from the projection room.
RESIDUAL MAGNETISM.— As applies to a dynamo, the magnetism retained by its field magnet when the machine is not in operation.
RESISTANCE. — That property of an electrical conductor which opposes the flow of current. Also the term frequently applied to a rheostat.
RESISTANCE COIL. — A coil of resistance wire, such as is used in making up the resistance of a wire coil rheostat.
RESISTANCE LOSSES.— Losses due to the resistance the current encounters in opposition to its flow. See "Copper Loss."
RESISTANCE OF ARC.— The resistance offered by the floor of the positive crater in the arc stream and the tip of the negative carbon.
RESISTANCE WIRE.— Wire composed of special alloy designed to offer a fixed pre-determined resistance to current flow. It is used for various kinds of rheostats.
RETURN WIRE.— Same as "Negative," which see.
REVERSIBLE MOTOR.— An electric motor which may be run in either direction, as in street car work.
REWINDER. — A device for transferring film from one reel to another.
REWINDING. — The process of transferring film from one reel to another. This process is necessary each time a film is projected in order to change the beginning of the film from center to outside of film. roll.
RHEOSTAT. — A device consisting of several units of resistance which are electrically coupled in such way that the current must pass through the entire length of each unit in order to reach the next. A rheostat may be adjustable, so that the current may be forced through the entire series of resistance units, or some of them be cut out, at the will of the man. in charge, or it may be non-adjustable so that the current must pass through the entire series of coils or grids. The resistance of a rheostat may be made up of coils of resistance wire or banks of cast iron resistance grids.