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In the work reported in this bulletin, horizontal surfaces were used for registering measurements. A Macbeth illuminometer provided illumination figures, while ultraviolet measurements were made with a meter developed by Rentschler. The authors believe that the two main contributions of their study are, first, its general nature (measurements were taken in fourteen cities of widespread geographic distribution: New Orleans, Los Angeles, San Francisco, St. Louis, Washington, Baltimore, Philadelphia, Pittsburgh, New York, Cleveland, Chicago, Detroit, Boston and Buffalo) and, second, the determination of the ratio of the antirachitic ultraviolet shorter than 313 millimicrons to the illumination.
Measurements of Ultraviolet Radiation and Illumination in American Cities During the Years 1931 to 1933. JAMA. 1937;109(19):1572. doi:10.1001/jama.1937.02780450076042