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

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406 FRANK BENFORD [J. S. M. p. There is only one disease, rickets, for which ultra-violet radiation is an accepted specific, but there is good evidence that the same radiations that produce sunburn and tan are of material aid in the cure of several diseases. It has long been accepted that sunlight has great curvative properties, and the recent development has been the identification of the rays that are active in certain cases. The purpose of this paper is to give some physical facts about the radiation characteristics of two mercury lamps, leaving the precise effects /OO 30 80 70 8* 20 /OO 200 30O SOO 2OOO FIG. 2. 7OO 8OO BOO /OO ZOO 3OO 3OOO Effectiveness of radiation in producing erythema or reddening of the skin. and effectiveness of the various wave-lengths to be determined by the medical profession. Glass is almost perfectly opaque to the therapeutic rays and hence sunlight received through a window is non-therapeutic, and the glass of the ordinary incandescent lamp renders it equally ineffective. As a result, we who spend a great part of our lives indoors are completely cut off from a vital factor in our well-being. This is a condition that has been the subject of considerable thought and discussion on the part of medical men for years past, but they have been unable to supply the missing ray, and have been forced to wait for the physician and lamp engineers to bring artificial light up to the standard set by nature. Two new units are now available for dupli