Abstract
Although a study of the photo-electric activity of metals in air can contribute little to the scientific interpretation of the phenomenon, yet it acquires a greater interest and some practical importance in connection with the physiological effect of ultra-violet light. In employing such light for therapeutic purposes, it is necessary to know which are the effective rays for the treatment under consideration, and how different sources vary as regards intensity of radiation. As the primary cause of the physiological change produced by light is probably photo-electric action, it is not surprising that several investigators have suggested the use of the photo-electric activity of a metal plate in air as a means of estimating the quality and intensity of the radiation.
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