Illuminating Engineering Society, Association of Public Lighting Engineers (Great Britain) · [London] · leaf 214
M / I P£.*/VS OF Ri -FE ?£r/VCf ^ \^ SN>__ … ////////////////////// //A////// Y7777777777777777T/ FIG. 9 SECTION OF CHURCH to shew method >/=■ ESTIMATING MEAN HORIZONTAL. ILL-UMINflTtON. The total flux is 4480+560=5040lumens. Hence the mean horizontalillumination is 5040 yj^FL = 2*95 foot-candles. The effect of the lamps being hung ona…
Lighting
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