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June 22, 1929, Vol 92, No. 25 >
ARTICLE | June 22, 1929

THE CLINICAL VALUE OF SUNLIGHT THROUGH ULTRAVIOLET TRANSMITTING GLASS

GEORGE W. CALDWELL, M.D.; ROGER H. DENNETT, M.D., D.Sc.
JAMA. 1929;92(25):2088-2090. doi:10.1001/jama.1929.02700510018004.
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This is a report of a study of the clinical value of sunlight transmitted through certain window glass substitutes, which are designed particularly to transmit a portion of the solar ultraviolet rays of a wavelength known to be of definite therapeutic value and which are excluded when sunlight passes through the usual type of window glass. In order to investigate the efficiency of this particular glass, a solarium was built on the roof of the hospital where children from the wards could be exposed regularly to the sunlight.

Our work commenced in May and continued through June. It was then interrupted through the summer and resumed again in October of the same year to continue until May of the following year. During the period of observation estimations were made of the blood calcium and phosphates, as well as of the hemoglobin. These estimations were made at the beginning of the

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