Illuminating Engineering Society, Association of Public Lighting Engineers (Great Britain) · [London] · leaf 425
Fig. 1.—Showing a sign made of glass halls exliibiled on the Terrace of the Trocadern. Pari … Fig. 2.—Showing figures outlined in glass balls.least 3^ in. broad. These, however, separate observer finds it difficult to re-are lower limits, which hold only for cognize objects which he passes at amotionless, attentive, and keen-sighted speed of 50 miles per hour, or 75 ft. perobservers. The…
Lighting
Internet Archive · Gerstein Library, University of Toronto · Public Domain Mark 1.0. Free to use for anything.
