Illuminating Engineering Society, Association of Public Lighting Engineers (Great Britain) · [London] · leaf 202
Fig 3.—lllumiuation of Composing Frames—Solicitors Law Stationery Society. … Fig. 4.—lUumiDation of Composing Frames—Messrs. Cassell k Co, 174 iHfi ILLtJMlNATiNG ENGINEER. ^^suaI value of the lower illu-mination is depreciated. It is thereforeinsufficient to specify a certain mini-mum illuniination as necessary unlessit is qualified in some way to preventthe occurrence of…
Lighting
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