Illuminating Engineering Society, Association of Public Lighting Engineers (Great Britain) · [London] · leaf 635
st and darkest portions of the paperin each case was also taken. This led It will be seen that notwithstandingthe far more distinct shadow from thedirect system the numerical shadow-ratio is not so very different. Yetto the eye the shadow from indirect(and also the semi-indirect) units fadedoff so… … (a) Bare lamp. (b) Indirect bowl. Fig, 3.—A general view of the table referred to in Fig. 2. Note the difference in the shadow ofchairs on the wall, under the table and beneath the drawers in the background. to a somewhat curious result, as shownby the following table :— Surface Brightness. System…
Lighting
Internet Archive · Gerstein Library, University of Toronto · Public Domain Mark 1.0. Free to use for anything.
