Illuminating Engineering Society, Association of Public Lighting Engineers (Great Britain) · [London] · leaf 262
Fig. 5.—Special arrangement of a series of illuminated white screens havinjapertures through which the target is viewed. … Fig. 6. -View looking through the aperture attarget as shown in Fig. 5. My reply to the ninth question is thatit seems desirable to attempt to produceconditions of light similar to those existing also 5 ft. by 8 ft. are arranged, one at10 ft. the other at 40 ft. from the firingpoint and apertures…
Lighting
Internet Archive · Gerstein Library, University of Toronto · Public Domain Mark 1.0. Free to use for anything.
![An illustration from Catalogue of the international exhibition of contemporary medals. March, 1910 [electronic resource] (1911)](https://img.insideoutlibrary.com/img/200/ia-bml-NK6310_Am3-111-127.webp)
