Illuminating Engineering Society, Association of Public Lighting Engineers (Great Britain) · [London] · leaf 433
mm.) long, 8 inches (203 mm.)wide, and of about the same height.In the bottom there is an opening 3|inches (85 mm.) by If inches (44 mm.).The box may be laid on the page of anopen book, and the part of the paperseen through the opening becomes thespecimen to be tested. A small electric lamp… … \ . ^^ Specimen under Test ^ ^^ ^ Double Prism in Plan SCALE. > I 1 H INCHtS Gloss Testino. Mr. Trotters description of his gloss-tester is subjoined at the request of theCommittee, since the recommendationsin this Report require that some standard-ising instrument should be available. An…
Lighting
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