Illuminating Engineering Society, Association of Public Lighting Engineers (Great Britain) · [London] · leaf 95
ribution curves :photography has also the advantage ofintegrating with regard to time, and hastherefore a special application for purelyrelative measurements of sources whichfluctuate very rapidly over a short intervalof time. (Tests on the star-shells usedin military operations might furnish acase… … Fig. 4.—Showing that the visible rays form arelatively small proportion of the radiationfrom an incandescent solid. this source, shows at a glance the difficultyof the problem. By special absorbingmethods we have to obliterate the greatmass of the radiant energy, leaving onlythe small shaded area…
Lighting
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