Illuminating Engineering Society, Association of Public Lighting Engineers (Great Britain) · [London] · leaf 282
othat in the event of a failure of the ordin-ary lighting taking place, when theescalator is crowded with people, theemergency circuit would be available.The bowls are well out of the range ofview (in fact, so high as to be only withdifficulty included in the field of thecamera), and as they are… … Fig. 2.—View, looking >wn from half-way up the Escalator, showing the two Bowlsoverhead. note that, by the use of three times asmuch candle-power in one bowl as in theother, it has been found possible to get afair degree of uniformity in illumination,in spite of the distance of the treads from…
Lighting
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