The book Contributions to Photographic Optics was written by author O Otto Lummer Here you can read free online of Contributions to Photographic Optics book, rate and share your impressions in comments. If you don't know what to write, just answer the question: Why is Contributions to Photographic Optics a good or bad book?
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Schott and Co. have, during the dozen years of the operation of their factory, put out on the market some hundreds of kinds of glass, some of which have since been withdrawn, not being found of permanent value. Their present catalogue enumerates some seventy-five different kinds, ranging from a very light boro-silicate crown of index 1'4967 to a densest silicate flint of index 1*9626. A table containing a selected few from their current list is here appended. Table of a Few of the Jena Glasses ...Factory Number. 225 S 30 O 802 O 40 138 O 20 1209 381 O 726 -O 376 230 O 118 41 S 57 Description. Light Phosphate Crown . Dense Barium Phosphate Crown Boro-silicate Crown . Silicate Crown .... Silicate Crown of high refractivity Silicate Crown of low refractivity Densest Baryta Crown Crown of high dispersion . Extra Light Flint . Ordinary Light Flint Silicate Flint of high refractivity Ordinary Silicate Flint Dense Silicate Flint . Densest Silicate Flint Refractive Mean Md-I Index Dispersion Mk-/*o /Ad- f^-f^' = y.
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