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 311
Fig. 177.—Distribution of illumination (lamps staggered). Fig. 177 shows a sine wave type of illumination curve. Thisdistribution curve has a relatively low maximum and is as welladaptable to practical realization as any curve obtainable. Ithas, however, one defect. The maximum value occurs at… … Fig. 178.—Distribution of illumination (lamps staggered). order that the light source may be removed as far as possiblefrom the center of the field of vision when the eye reaches thepoint toward which the maximum candle-power is directed. Many types of illumination curve could be given and…
Light · Photometry · Electric lighting
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