On the theory of the Matthews and the Russell-Léonard photometers for the measurement of mean spherical and mean hemisperhical intensities (1905)
National Bureau of Standards · leaf 12
or 6„^ in the equation (9) Ie„, sin e^=f(6J sin 6^=1 / f (0) sin 6 d 6 (m-D- If we placed the mirrors at the angles found, then for that particu-lar intensity curve we would get the true mean spherical intensit3^ HYDE.] INTEGKATING PHOTOMETERS. 263 Let us now consider several typical cases: CASE I.… … Fig. 1. For 20 mirrors the angular distribution would be [eq. (9)] h^ sin ^^=sin /?^=^ / f {0) sin BdO: 20 sinOdO {m-DL (w-1) (TO-1)20 (12) from which (13) =20 rcos^i (w-l)20 ^.=-- 4 [cos.]^^ The solution to this case is given in column III of Table I, which isself-explanatory. In columns I and II…
Photometry · Lamps and lighting · Optics
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