Snelling, Henry Hunt, 1816-1897 · [New York : W.B. Smith] · leaf 273
ceed an hour, as the iodine and silverlose their requisite photogenic properties.*It is necessary to observe, that the iodineought never to be touched with the fingers,as we are very liable to injure the plate bytouching it with the hands thus stained. Third Operation.—The third opera-tion is the… … 3 6 lengthwise, of Daguerres camera, a is aground glass by which the focus is adjusted ;it is then removed, and the photographicplate substituted, as in c, fig. 37. b, is amirror for observing the effects of objects,and selecting the best points of view. Itis inclined at an angle of 45p, by means…
Photography · Art and photography
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