Light, photometry and illumination : a thoroughly rev. ed. of ''Electrical illuminating engineering'' (1912)
Barrows, William Edward, 1878-1960 · New York ; London : McGraw-Hill Book Co. · leaf 168
UX CALCULATIONS 153 The method of procedure in the upper hemisphere is the sameas in the lower hemisphere as indicated in the figure. Project thepoints / and/ upon the vertical. Then half the distance mmbetween the extreme projections, to scale, is the value of themean spherical candle-power, the… … M.S.C.P. 36X.HS.C.P. 52U.H.S.C.P. 20 Fig. 89.—The Kennelly diagram. candle-power, 52; mean upper hemispherical candle-power, 21.The total flux in lumens is 4;r times the mean spherical candle-power, as in the other methods. Theory of the Method.—The mean spherical intensity of aluminous source…
Light · Photometry · Electric lighting
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