Illumination items: Checking up an industry on its lighting

At a recent convention of the Association of Iron and Steel Electrical Engineers,¹ Mr. Ward Harrison² presented in a paper entitled “Fifteen Years of Steel Mill Illumination What Change?” a study of what such lighting was, is, and should be.³ In terms of the cost of steel, the cost of light from 1912 to 1927 has gone down in the ratio of 16 to 1. If one foot-candle was the illumination provided in the earlier day, the same ratio of cost of light to cost of steel would today provide sixteen foot-candles.