Illuminating Engineering Society, Association of Public Lighting Engineers (Great Britain) · [London] · leaf 320
:_.::.-: rmn » t T * v r r f rq - [TUDINAJ SrCTION Whole Sdi & Ct rq I u(nma4«d Rig 7. THE ILLUMINATING ENGINEER (june) 305 is sufficient in carriages or that 7 f t.-candlesis objectionably high. Constant vibra-tion gives a hazy effect to printed matter,while increase of illumination, by… … PLAN Fig. S. paper, renders perception easier. Onecould read without difficulty on the topof a rattling omnibus when it would beimpossible in the comparative obscurityof the interior. Quits double the amountof illumination is, therefore, necessary ina vehicle to that in a room, in order toread with…
Lighting
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