Illuminating Engineering Society, Association of Public Lighting Engineers (Great Britain) · [London] · leaf 270
R 4-00 mm.. Sx H jqnsKUKXxm - E Co ^JT Ci W v. B Scale. 0 HI in v> w 50 … PlGS. 28 and 29.—Apparatus for investigation of reflexion. purposes of adjustment : and whenturned so that I could see my eye reflectedin it, in a line with the sighting wire,the zero angle eould be adjusted. After a few experiments on visitingcards, a series on Bristol board wasbegun. This is a…
Lighting
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