In 1923, experiments were carried out to ascertain the length of the ultraviolet waves which are endowed with the remarkable property of preventing or curing rickets. It was found that, in order to be of value, "ultraviolet waves must have a length not longer than 302 or possibly 313 millimicrons."1 This conclusion was arrived at by means of an extended series of experiments which made use of selective glass filters and has been confirmed by the recent work of Luce.2 The study served to emphasize the remarkable specificity of waves of light in relation to rickets, showing that a difference of about 20 millionths of a millimeter determined whether ultraviolet radiation was either effective or ineffective in this respect. The data, however, were not sufficiently refined, the analysis of the spectrum not precise enough to warrant a definite conclusion as to whether the intense waves of the mercury
HESS AF, ANDERSON WT. THE ANTIRACHITIC ACTIVITY OF MONOCHROMATIC AND REGIONAL ULTRAVIOLET RADIATIONS. JAMA. 1927;89(15):1222–1225. doi:10.1001/jama.1927.02690150032010
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