Illuminating Engineering Society, Association of Public Lighting Engineers (Great Britain) · [London] · leaf 262
ntilogs of his observations with constant angle of incidence andvarying angles of omission when plottedas polar curves lie very closely on circleswhich agrees with his result No. 6.But plotting his observations with theangle of emission constant and varying s^~ ZP __-J0—— LI -10 20 ... lOs^ \ \ 10… … Fig. 14.—H. Wright. Angles i. Family ofdifferent k angles of incidence yields a family ofelliptical curves having their major axesnormal to the illuminated surface. Ifthese major axes were inclined in eachcase at an angle equal and opposite tothe angle of emission, they might beaccounted for by the…
Lighting
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