Snelling, Henry Hunt, 1816-1897 · [New York : W.B. Smith] · leaf 296
necessity ofpassing over it the hot iron. This salt attracts much less moisturefrcm the air than the chloride of sodium ;and this property renders it much morepreferable for the preparation of positivepaper. The chloride of silver which it furnisheswith nitrate of silver possesses the… … EXPOSITION OF THE DARK CAMERA, CANNOT give very pre-cise indications upon theexposition of the dark ca-mera. This exposition isaccording to the degree oflight, and it varies accord-ing as we make the image appearby the protosulphite of iron, by thepyro-gaLic acid, or simply by theordinary gallic…
Photography · Art and photography
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