Identifier: americanannualof1918newy (find matches)
Title: The American annual of photography
Year: 1918 (1910s)
Authors:
Subjects: Warren E. Comstock of Kansas City, Missouri, photographed in 1861. Original image imprinted on copper plate. Publisher: New York : Tennant and Ward
Contributing Library: Harold B. Lee Library
Digitizing Sponsor: Brigham Young University

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Figure 1. Daguerres process, when perfected, consisted of five opera-tions, viz.:—the polishing of the silver plate; the coating ofthe plate with iodide of silver by submitting it for abouttwenty minutes to the action of iodine vapor; tlie projectionof the image of the object upon the golden-colored iodizedsurface ; the development of the latter image by means of thevapor of mercury; and lastly the fixing of the picture byimmersing the plate in a solution of sodium hyposulphate.The exposures required from three to thirty minutes. 182
Text Appearing After Image:
Illustrating article Figure 2. The Evolution of Photografhy DuringYears, by Warren E. Comstock. the Past Fifty 183 Several improvements were effected until 1841, when FoxTalbot evolved what he called Calotype or beautiful pic-tures, which was a distinct advance over the originalDaguerrotype. The next step in Photography was the Albumen Processon Glass/ invented by Niepce de St. Victor, a nephew ofNicephore de Niepce. He employed a glass plate, and coatedit with iodized albumen. This was later perfected by G. Le-Gray. Here is where the faithful hen comes in to lay hertribute on the altar of the Arts. The whites of five fresh eggs,mixed with about one hundred grains of potassium iodide,about twenty grains of potassium bromide, and ten grains ofcommon salt, beaten up into a froth and allowed to settle fortwenty-four hours, when the clear liquid is decanted off. Acircular pool of clear liquid is poured on a glass plate, sweep-ing off the excess of albumen, and so leaving an even film.Then

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