Illuminating Engineering Society, Association of Public Lighting Engineers (Great Britain) · [London] · leaf 506
ation. A knowledge of the diversityratio for a given system of lighting wouldenable the maximum to be deduced atonce from the minimum. This diversityratio would depend on the spacing oflamps, and could in most cases be esti-mated pretty accurately. It was clearthat the average illumination would… … Fig. 2. calculated the average by dividing the areaof the curve by its base. In one case theaverage was one-third of the maximum,and in the other case, where the falling-offwas more rapid, the average was onlyone-fifth of the maximum. In this way,by plotting the horizontal distribution 500 THE…
Lighting
Internet Archive · Gerstein Library, University of Toronto · Public Domain Mark 1.0. Free to use for anything.
