Illuminating Engineering Society, Association of Public Lighting Engineers (Great Britain) · [London] · leaf 174
(5 to 2.5 foot-candles. The hori-zontal illumination of the footwaywas found to be 54 to 47 foot-candleson the ground level, -tthile at a heightot 3 ft. 3 in. (this height, of course,being chosen as a fair average at «hichany article would be held in ones hand)above ground level the horizontal… … Fl(i. 8.—Another example of Messrs. Lilley & Skinners Boot Stores, in the district of theGas Light & Coke Company. 146 THE ILLUMINATING ENGINEER. scribed. In this case the illumination,as shown in the picture, is due to three600 candle-power high-pressure andtwo 300 candle-power inverted…
Lighting
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