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 324
ible with the larger values of M. The curve il/ = 4 is tobe regarded, therefore, not merely as the ideal curve for a certainrelatively close spacing of light units which the public is not asyet educated up to, but as the best possible distribution whichcan be applied to any of our present-day… … Fig. 190.—Distribution of light from a flame arc lamp equipped \vithco-axial electrodes. Fig. 189 shows the distribution of light from an 80 candle-power series street lamp equipped with a prismatic reflector in amilk-glass envelope as shown in Fig. 188.^ Such a unit is well adapted to street…
Light · Photometry · Electric lighting
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