Electrical engineer's pocket-book: a hand-book of useful data for electricians and electrical engineers (1901)
Foster, Horatio A. (Horatio Alvah), 1858-1913 · New York, D. Van Nostrand co.; London, E.& F.N. Spon, ltd. · leaf 423
the relative luminosity of an incandescent lamp at different regionsof the visible spectrum. On this subject Mr. E. L. Nichols states the following : The most important wave lengths, so far as light-giving power is con-cerned, are those which form the yellow of the spectrum, and the… … ORANGE YELLOW Fig. 6. Regions of Spectrum. Luminosity is the factor which we must take into account in seeking acomplete expression for the efficiency of any source of illumination, and themethod to be pursued in the determination of luminosity must depend uponthe use to Avhich the light is…
Electrical engineering
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