Illuminating Engineering Society, Association of Public Lighting Engineers (Great Britain) · [London] · leaf 276
Direct glare. Reflected dare. Figs. 1 and 2.—A brilliant source of light is not necessarily good lighting. Either direct glare or indirect glare is harmful. … Fig. 3.—Deep black shadows are troublesomeand a source of constant danger because ofwhat thev mav conceal. Fig. 4.—Lighting equipment should bethoroughly cleaned at frequent intervals. customary in the United States. W cknow that 3 or 4 foot-candles will enableus to see more detail than will 1…
Lighting
Internet Archive · University of Toronto Libraries · Public Domain Mark 1.0. Free to use for anything.
