Illuminating Engineering Society, Association of Public Lighting Engineers (Great Britain) · [London] · leaf 451
Fig. 4.—Imperfectly shaded lighting of com-positors frames by upright incandescent gas.The incandescent mantle is fully exposed to theeye and the angle of glare is 46° at the lower,and 1G° at the upper edge of the upper case.The shadow of the compositor also is thrown onthe frame by a similar…
Lighting
Internet Archive · Gerstein Library, University of Toronto · Public Domain Mark 1.0. Free to use for anything.
