Illuminating Engineering Society, Association of Public Lighting Engineers (Great Britain) · [London] · leaf 247
ns of the room and the area and surface-brightness of the illuminated frieze it is possible to estimate the illuminationprovided at the level of the seats and Council table (Mr. A. P. Trotter). B 2 232 THE ILLUMINATING ENGINEER (may) The point at which the illumination Is tobe found is 20 ft. below… … 20/32-4 is the cosine of the angle ofincidence. From the square ol theslant height and the cosine we obtain•240 foot-candle for the illuminationfrom AB. and similarly 108 from BOPom times the sum of these is 1-392,which h only 2 per cent, different fromthe former result. (Probably a fluke.) The…
Lighting
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