Journal of the Society of Motion Picture Engineers (1930-1949)

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414 PETER MOLE [J. S. M. P. E. standard in the industry. Many desirable locations isolated from a commercial supply require the use of electric generators driven by prime movers. Gas engine driven generators are not new to the industry. In the days of silent pictures many satisfactory plants were built, using aeronautical engines connected to direct-current generators and mounted on trucks. FIG. 1. 40-kw, gas-electric generator set. The advent of sound pictures made obsolete most of the gas-electric generators of the old type. The engines heretofore used were principally war-time Liberty, Curtis, OX 5, and Hispano engines. The valve actions were always noisy, and the engines themselves in most cases had fallen into disrepair and were unreliable. As location work was revived, the small booster lighting plants were developed, and the better types of automobile motors were found suitable. Very satisfactory plants have been built utilizing Chevrolet, Cadillac, Lincoln, and other engines that could develop