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NEW DEVELOPMENTS IN PORTABLE GAS-ELECTRIC GENERATORS FOR MOTION PICTURE LIGHTING*
PETER MOLE**
Summary. — A newly developed gas-electric generator, recently made available to the industry, is described. There are two types, the small units having a capacity of 40 kw. and the larger ones a capacity up to 160 kw.
The gas-electric generators described have unique features of voltage control, which is an essential requirement when generators are used in the field with incandescent lamps as a load. They have been designed to have minimum weights for their capacities and are more silent in operation than any units heretofore built.
It is the purpose of this paper to describe some developments that have been made in the past year toward producing suitable gas-electric generators for supplying current used in motion picture production on location. During the earlier years of sound motion pictures, the limitations imposed by the recording operations restricted the taking of pictures almost exclusively to sound-proofed stages. In the past two years technologic advance in recording equipment and operation has made it entirely practicable to carry on location work.
In order that the shots taken of scenes away from the studios may attain to the same high quality as those taken in the studios, it is necessary for both day and night work on location to utilize the advantages of lighting by artificial means. The supplementing of daylight with artificial illumination is designated in studio vernacular as "booster" lighting.
In most cases the current for booster lights may be supplied by generators having capacities up to 60 kw. The lighting of night scenes to a large extent parallels that of lighting stages, large values of current in this case being required. Current for location lighting may be obtained from either of two sources. Where power companies have transmission lines reasonably close to the location, those lines may be tapped and portable motor-generator sets connected to them to produce the 11 5volt direct current, which is
* Presented at the Spring, 1933, Meeting at New York, N. Y. ** Mole-Richardson, Inc., Hollywood, Calif.
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