Illuminating Engineering Society, Association of Public Lighting Engineers (Great Britain) · [London] · leaf 26
umen correctly expresses luminousvalues for all cases and conditions The general idea of the Lumen andcandlepower can be quite clearly illu.--trated by an analogy. An Analogy for the Lumen. Let us take the case of a lake, andassume that it had been the practice torate the caT)acity of lakes by the…
Lighting
Internet Archive · Gerstein Library, University of Toronto · Public Domain Mark 1.0. Free to use for anything.
