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 315
he agreement of the two curves is admirable up to an angle of 300 LIGHT, PHOTOMETRY AND ILLUMINATION about 62 degrees. The curves AI — A and il/ = 6 would also becomparatively easy of attainment with the incandescent lampor with the inverted gas mantle. This is of especial importancesince, with… … < 300 5 10 15 20 25 30 35 40 45 50 55Degrees 60 65 Fig. 182.—Candle-jDower curves d/h = 4:. Smaller values for M than 4 would obviously fulfill all theconditions imposed by the requirements of good illumination.It will later be shown by our study of glare effect that a valueM = 3 is necessary to…
Light · Photometry · Electric lighting
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