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690 RICHARDSON'S BLUEBOOK OF PROJECTION
each such unit, and through them all successively, unless otherwise provided.
Fixed Resistance
A rheostat in which the current must pass successively through all resistance elements therein contained.
Resistance, Adjustable
A rheostat having means provided for adding to or subtracting from the number or numbers of the resistance elements in use at will of the projectionist.
Ring, Oiling
Pertains to a method of oiling machinery bearings. A metal ring of larger diameter than the shaft to be lubricated is hung on the shaft and able to rotate therewith, passing through a slot in the bearing. This ring, being of much larger diameter than the shaft, hangs down below it into a depression in the bearing support that is filled with oil. As the ring rotates oil is carried up to the bearing, where it is distributed by means of spiral slots cut in the bearings.
Rocker Arm
That part of a dynamo or motor to which the brush holders are attached.
Rotary Converter
A dynamo for generating both A.C. and D.C. If conductors are let from the armature of a D.C. dynamo to the collector rings of a rotary converter, A.C. may be obtained. If the machine is run as a D.C. motor, A.C. may be taken from the collector rings. If run as a synchronous A.C. motor, D.C. will be delivered by the commutator. The machine also is denned as a rotary transformer.
Rotary Field
The magnetic field created by a combination of alternating currents differing in phase. If an armature hav