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 100
, p. 79, 1909. THE PRINCIPLES OF PHOTOMETRY 85 the light from the two sources strike the respective sides of thescreen at the same angle. Any unequal obliquity of this naturewill introduce an error and since the two sides are fixed relativeto each other any increase in the obliquity of one side… … Fig. 29.—Effect of changing the incHnation of tlie sides of the wedge(angles measured from normal to the rays). value as to give maximum brightness since this point occurs onthe flat part of the curve and maximum sensibility will beobtained at the same time. The Elster-Joly diffusion photometer…
Light · Photometry · Electric lighting
Internet Archive · Boston Public Library · Public Domain Mark 1.0. Free to use for anything.
