Constant Potential Generators for Motion Picture Projection

The following paper discusses the development through which the constant potential generator has been carried for producing satisfactory results in projecting pictures in modern motion picture theatres. To eliminate any flicker or decrease of illumination on the screen when a second lamp is connected to the generator while the other lamp is being used for projecting pictures, has required very careful study of motion picture projection requirements by the design engineer. As a result, these generators, with their control equipment, have been perfected so that several lamps can be operated from the same generator, using different current values in the various lamps, without producing any visible flicker or decrease of illumination of pictures on the screen. The ability of the machine to carry several lamps at different current capacities will fulfill the requirements of modern theatres where it is frequently desirable to operate stereopticon lamps, spot lamps, flood lamps and a projector at the same time or any combination of these machines.

Print ISSN

0096-6460

Published

1922-05

Content type

Original Research

DOI

10.5594/J12450