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MANAGERS AND PROJECTIONISTS 547
Please understand that all the above is manufacturers' statements, backed and sponsored by the Simplex Division of the International Projector Corporation.
THE ROTH ACTODECTORS
These machines are motor generator sets designed to receive A. C. from the supply lines, and to deliver D. C. to the light source. They will deliver any desired number of amperes D. C. up to the rated capacity. It is so designated that the arcs supplied by it must be connected in parallel (multiple) with each other if more than one be burned simultaneously. It will, of course, supply any number of arcs, of the same or of different amperage, up to the capacity of the machine. The striking or switching off of one arc does not appreciably affect any others which may be in operation at the time.
The Actodector consists of an A. C. motor — which may be had for any desired commercial voltage, cycle or phase — coupled to a 70-volt D. C. generator. The outfit includes an enclosed operating panel equipped with a voltmeter, an ammeter and a generator field rheostat with the usual control handle.
The machine is built in accordance with the established standards of the American Institute of Electrical Engineers, of the Electric Power Club and of the National Board of Fire Underwriters. It is approved by the Underwriter's Laboratory.
For motion picture projection, where not more than two arc? are used at a time, when one or more arcs are struck, the machine instantly, automatically, and without any manipulation of the generator field rheostat handle, supplies the right arc amperage and voltage. The series and shunt fields of the generator are so designed that a practically constant voltage is maintained at any amperage from no load to full load. All that is necessary is to set the generator voltage at 70, and strike one or more arcs.
The Actodector may be had in the following sizes ; the double numbers meaning that each machine may be used for either one or two arcs of the capacity indicated :
25 — 25 amperes 70 volts
35 — 35 amperes 70 volts
50 — 50 amperes 70 volts
75 — 75 amperes 70 volts
100—100 amperes 70 volts