Illuminating Engineering Society, Association of Public Lighting Engineers (Great Britain) · [London] · leaf 634
LLUIkllNATIXG ENGINEER 619 T-square, indiarubber, ruler, &c., areslightly tilted to show the shadows at theiredges which, although not immediatelyperceptible to a casual observer, wouldnaturally cause trouble immediately oneattempts to draw. This justifies the Fig. 2. These show the effect of…
Lighting
Internet Archive · Gerstein Library, University of Toronto · Public Domain Mark 1.0. Free to use for anything.
