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 14
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) mean[7,sin^]==ip(^)sin6(:?6z:.i rco8… … . 1 . _, 2or . , rr^^ 1_ -J(m—1 (m-l)2o The solution to this case is given in column VIl of Table I. Having determined the actual distributions of mirrors for cases I,II, and III, the distribution for each case was tried in the other twocases, and the two equal distributions were also tried in each…
Photometry · Lamps and lighting · Optics
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![An illustration from Nicolai Copernici Torinensis De reuolutionibus orbium coelestium, libri VI : Habes in hoc opere iam recens nato, & aedito, studiose lector, motus stellarum, tam fixarum, quàm erraticarum, cum ex ueteribus, tum etiam ex recentibus obseruationibus restitutos: & nouis insuper ac admirabilibus hypothesibus ornatos. Habes etiam tabulas expeditissimas, ex quibus eosdem ad quoduis tempus quàm facillime caculare poteris. Igitur eme, lege, fruere. [Line in Greek] (1543)](https://img.insideoutlibrary.com/img/200/ia-nicolaicopernici00cope-321-212.webp)
