Illuminating Engineering Society, Association of Public Lighting Engineers (Great Britain) · [London] · leaf 584
f mills of that city, and wassurprised to find that there were still49,436 flat-flame burners in use. A seriesof tests in 18 mills recently showed an average maximum of 32 foot-candles anda minimum of 8-6 foot-candles by day-light as compared with 0-62 foot-candleswith flat flame burners and 0-58… … Fig. 1.—Illumination of drawing-in or twistingin frame by local shaded light. mills, now that so many more efficientmethods are available. Many thousandsof inverted incandescent burners arebeing installed yearly in Manchester,and by this means as much as 6—8 foot-candles can be obtained on the…
Lighting
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