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 13
in the quadrant 6^=90° to ^=180° are merely the supplements ofthose given in the table, and are hence omitted. (14) CASE II. Iq—^ a sin ^=sin 6 This curve corresponds approximately to the intensity curve of ahairpin or horseshoe filament. The integral solution [eq. (8)] is mean [/asin e\-=^ {/{d)… … 20 Fig. 2. HYDE.l INTEGRATING PHOTOMETERS. 265 The solution to this case is given in column V of Table I. CASE III. (17) L =2^ COS ^=cos e This curve corresponds approximately to the intensity curve of aNernst or of a meridian lamp.The integral solution [eq. (8)] is IT TT TT (18)…
Photometry · Lamps and lighting · Optics
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