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2020-05-23 22:50:04
Vogel, H. [Hermann] W. [Wilhelm]
LA PHOTOGRAPHIE DES OBJETS COLORÉS AVEC LEURS VALEURS RÉELLES. MANUEL DES PROCÉDÉS ISOCHROMATIQUES ET ORTHOCHROMATIQUES
Paris: Gauthiers-Villars, 1887. First edition. 8vo., ix, 193 pp., 2 plates, containing 2 photoglypties and 1 chromolithograph,15 illustrations in text. Original printed wrappers, which are lightly soiled, moderately worn at the blank edges, the front wrapper is partially detached at the spine; text toned but unopened. A near very good copy. "Dr. H. W. Vogel discovered in 1873 that dyes added to photographic materials extended their sensitivity to colours other than blue. In 1882 commercial dry plates were produced, and these isochromatic, or orthochromatic, plates soon came into general use. Because they were much more sensitive to blue than green, they were normally exposed through a yellow filter to balance up the exposure. In 1884 Dr. Vogel discovered a method of sensitising plates to orange as well as green light." Coe, Brian, Color Photography: The First Hundred Years, 1840 - 1940, p. 34. These discoveries were fundamental for correct color photography and three-color photography. "Vogel's invention of color sensitizers. By the addition of dyes to silver bromide collodion he obtained practical three-color separation negatives, the results of which he exhibited at the Paris Exposition of 1878." Eder, p. 647. This title is unique to this French edition, based upon earlier texts by Vogel. Translated into French by Henry Gauthier-Villars, and augmented with notes from the author. The three "photoglypties" are commonly known as Woodburytypes.Roosens and Salu 7664. [Attributes: First Edition]
Bookseller: Andrew Cahan: Bookseller, Ltd [United States]
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