Illuminating Engineering Society, Association of Public Lighting Engineers (Great Britain) · [London] · leaf 348
on curve, is determinedfor 70 degrees, using the line LL, G beingthe intersection of lines FG and HG.The extension of the process, using linesKK, KK, MM, MM, etc., gives resultsfor heights of 25 and 30 feet respectively.In dealing with normal illumination wemay first obtain a horizontal… … Fig. 1.—Complete Chart for Determination of Iliumination Curves on a Logaritliinic Scale. (Mr. \V. DA. Kvan.) 338 THE ILLUMINATING ENGINEER (no% . 1916) 04 foot-candles coincides with 1 foot-candle on the chart. On a standard blue print the curveplotted to a logarithmic scale ma) havea range of…
Lighting
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