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MANAGERS AND PROJECTIONISTS 549
except when it is supplied with a single phase motor, in which case it is a 3-bearing, 2-unit machine. Actodectors are all horizontal machines, and all except the multiphase 25 — 25 amperes machines are built with two separate units — separate motor and generator.
The motor rotor and the generator armature are both carried by one heavy shaft, supported at either end by heavy radial type ball bearings. The frames of the motor and generator are joined by means of a heavy, solid iron spacing ring, which gives a very rigid, compact type of construction.
The 2-unit actodector has a complete, separate motor and generator, the rotor and armature shafts of which are connected together by means of a flexible coupling. Both units are mounted rigidly on a heavy iron bed plate. Both units have large, sleeve type bearings.
RHEOSTATS. — For projection arcs, resistance in the form of rheostats is necessary to absorb the difference between the arc voltage and the 70 volt pressure supplied by the generator. Such rheostats may be purchased from any supply dealer. There must be one for each lamp to be operated. These rheostats are not supplied with the Actodector, unless specified when ordering.
Figure 168
Ballast Resistors for Actodectors
THE PANEL.— The instrument panel is 10 x 14 x 8% inches inches in dimensions. It is fitted with a voltmeter, an ammeter and generator field rheostat control. The face is hinged so that the interior of the metal box upon which it is mounted is accessible. It should, of course, be installed in the place where it will be most convenient to the projectionist.