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January 11, 1936


JAMA. 1936;106(2):126-127. doi:10.1001/jama.1936.02770020010056

Adequate lighting is a professional problem of special interest to architects and physicians. Among the fundamental investigations which have recently appeared is that by Ives, Knowles and Thompson 1 on daylight in buildings. All their observations were made in a specially constructed building across the Potomac from Washington. The site was selected so that the outlook would be unobstructed by adjacent buildings and not seriously obstructed by trees. It was oriented accurately north and south and the roof and window sections were adjustable, allowing for variation of conditions. Measurements of illumination within the building were made on a horizontal plane 36 inches above the floor at thirty-six stations by means of a photo-electric cell connected through an amplifying circuit to a recording potentiometer. The sky brightness was measured by means of a Weston illuminometer mounted on the roof of the building. No study of the effect of direct sunlight entering