Illuminating Engineering Society, Association of Public Lighting Engineers (Great Britain) · [London] · leaf 602
llumination by the cosine of the angle ofincidence). Thus a 16 candle-power lamp at a distance of 5 feet should give an illumina-tion = ^|j.,=064 foot-candle. It is po.ssible to specify and measure the illumination at any spot quite irrespec-tive of the number and arrangement of the lights…
Lighting
Internet Archive · Gerstein Library, University of Toronto · Public Domain Mark 1.0. Free to use for anything.
