Symbols for photometry and illumination approved as American standard

On August 4,1930 the “Symbols for Photometry and Illumination” developed by the Sectional Committee on Scientific and Engineering Symbols and Abbreviations were approved by the American Standards Association as an American Standard. The standard has been published in pamphlet form by The American Society of Mechanical Engineers, 29 West 39th St., New York, N. Y., from which copies may be obtained at a cost of 20 cents each.