Lummer, O. (Otto), 1860-1925, Thompson, Silvanus P. (Silvanus Phillips), 1851-1916 · London, New York, Macmillan and Co., 1900 · leaf 108
istances. To secure the last requires the fulfilment (at least approximately) of von Seidel’s fourth condition. In order, as he supposed, to give the over- achromatising power to this central negative lens, it was at first made of an extremely steep bi-concave of a light silicate flint cemented to… … specification. No. 15,107 of 1895, Fig. 38. — Cooke-Taylor Lens he describes several series of lenses. (Series III.). Ill these he takes advantage of the new Jena glass, employing for the positive lenses the densest baryta crown (0 1209), having a mean refractive index of 1*6114, while the negative…
Photographic optics
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