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

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410 FRANK BENFORD [J. S. M. P. E. the ultra-violet below 3000 A. in 1000 hours, but the total ultraviolet from 4000 A. down dropped only 15 per cent. G. E. SUNLAMP This lamp is of a new and unique type, and the present description FIG. 6. Uviarc spectrum, with and without Uviarc filter. is perhaps the first presented to an engineering society. The Research Laboratories of the General Electric Company at Cleveland, Lynn, and Schenectady have collaborated in the development, and the writer's connection has been that of analyst as the lamp has passed through various stages of growth. Essentially the lamp