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 195
r curve atwhich to read the candle-power of the source in this direction.To obtain this set 5 on the H scale over 10 on the D scale. Fig. 103,bring the runner to 1 on the D scale and under the runner in the 180 LIGHT, PHOTOMETRY AND ILLUMINATION second smaller circle P scale, read 63° 20, Assume… … Fig. 103.—Macbeths calculator. the line. Hold the two disks, and bring the runner to 5 on theheight scale. Under the runner on the outer scale read 542. Todetermine the position of the decimal point with both disks set,
Light · Photometry · Electric lighting
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