Illuminating Engineering Society, Association of Public Lighting Engineers (Great Britain) · [London] · leaf 161
onewas etched with lijdro fluoric acid,however, the projection vanished, thusshowing its specular origin. Reflectorswith this characteristic obviously tend togive a spotty ground-illumination.He exemphfied the importance of correctcentring of prismatic reflectors withregard to the light by some… … FlG. 2. tions of an actual loss of light. Couldthe authors endorse this loss ? Hepointed out that the ordinarily acceptedabsorption values for clear glass mustbe applied with caution to globes used\\ith flame sources. An upright gasmantle (Fig. 2) gave, when bare, thedotted curve A, but when a…
Lighting
Internet Archive · Gerstein Library, University of Toronto · Public Domain Mark 1.0. Free to use for anything.
