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March 27, 1920
2183
A moving picture theatre is a store with just one kind of merchandise to sell the public — good pictures.
Better Pictures Mean Larger Audiences
Screen, projection machine, film and lamp all contribute to the quality of the pictures but the light source is of prime importance.
Arc lamps operate more efficiently on direct current and produce a steadier, whiter light. To secure direct current from an alternating current supply, reduce it to the proper voltage, and eliminate interruptions between reels, the General Electric Company recommends the motor-generator compensarc shown above:
1. A motor generator connected to any supply voltage, either alternating or direct current and delivering direct current to the projection lamps at the proper current and voltage.
2. Motor starting device which starts the motor generator and automatically shuts it off when lamps are extinguished.
3. Control panel with ammeter for reading current and field rheostat by which the current at the arc can be increased or decreased.
4. Two short circuiting switches mounted on the projector pedestals to enable the operator conveniently to shift from one lamp to the other, without interruption between reels.
Emergency equipment: It is also advisable to use .\.C. Compensarcs (5) connected to the lighting circuit for use in case of failure of the power circuit to which the motor generator is connected.
With such equipment an exhibitor is assured of the best possible quality of light for his pictures. Compensarcs are safe, easy to operate, efficient, economical and reliable.
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