JF Ptak Science Books Quick Post
This is a large, full front page advertisement for ultraviolet therapy, and appears in the Illustrirte Zeitung (Leipzig) for September 21, 1922. Therapy using UV lamps of various origins was of relatively recent origin (ultraviolet radiation being discovered by Johann Ritter in 1801) as stated in the text here, which gives a pretty lengthy appreciation of the history of the use of crystal lamps, and noting (in paragraph four) that the principle in the invention of such material was Richard Kuch. (Kuch was a physicist and chemist who created the first mercury vapor quartz glass lamp in 1905 and the first mercury vapor high pressure lamp in 1906.) UV treatment does have its proper place in the history of medicine, but it certainly came to occupy a lofty perch in quack medical treatments for home use in curing everything from cancer to gout to dandruff via the "purple light rays". I really don't know all that much about this subject and was reporting on the design aspect of the ad--the treatment of the subject though certainly seems academic, complete with a priced guide to related literature.
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