Illuminating Engineering Society, Association of Public Lighting Engineers (Great Britain) · [London] · leaf 441
formly brightall over and has a low intrinsic brilliancy,but on the other hand the absorption loss isgreat, and in this respect it is a bad globe. In Fig. 7 are shown the results of usingwith an inverted mantle three sphericalglobes all of the same size, but havingdifferent diffusive qualities. The… … 3C 20 10 o to ao 30 Fig. 11.—Polar Curve of Inverted Mantle with Opal and Clear Optic Globe. THE ILLUMINATING ENGINEER. 427
Lighting
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