The book Practical Photo Micrography was written by author J E Joseph Edwin Barnard Here you can read free online of Practical Photo Micrography book, rate and share your impressions in comments. If you don't know what to write, just answer the question: Why is Practical Photo Micrography a good or bad book?
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■ A compromise is possible by using a dry collodion emulsion, and such an emulsion ready prepared is now to be obtained commercially, leaving only the coating of the plates to be ^ An Atlas of absorption-spsctra, by Dr. C. E. Kenneth Mees, has recently been published by Messrs. Wratten & Wainwright. In it the absorption- sp3ctra of nearly all dyes used in staining microscopic preparations are given, together with photographs of the spsctra transmitted by a large series of S3r33n5 that thsy now ...make. This work is the most complete on the subject that has yet been issued, and the reader is referred to it if further exact infonnition oa tha subject is desired. SCEEENS— PLATES— EXPOSURE 219 performed. After coating they keep for perhaps a week or so, and give extremely good results if the exposure is correctly timed. For negative-making, however, it will almost invariably happen that gelatin plates will be chosen, and the description of collodion processes will therefore be left until the making of lantern-slides is considered, since it is particularly for the latter that collodion is now best suited and most largely employed commercially.
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