Illuminating Engineering Society, Association of Public Lighting Engineers (Great Britain) · [London] · leaf 86
by their length thevisible area, and therefore candle powerof the light source at any angle, as shownin Fig. 1, where A. represents the lightsource or crater. 10 9 C.P. Ratio.6 5 4 3 surface when viewed from the horizontal,and would therefore give 18 candle-power. I cannot sufficiently emphasise… … Fig. 1.—Showing distribution of light from the crater of the arc lamp. This law is so definite that if photo-metric measurements when plotted givea different curve to the above, it is proofthat the source of light is not a planesurface but convex. In the high candle-power searchlight lamp which has…
Lighting
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