Snelling, Henry Hunt, 1816-1897 · [New York : W.B. Smith] · leaf 368
tographic paper, both for negative andpositive pictures. Fig. 5 is the glass trough for holdingthe nitrate of silver solution. … o. Fig. 6 is a frame for fixing in the ca-mera such plates of glass as do not requireto be exposed to the lens while still in thetrough. Flo-. 7 is a pressure frame for t thepreparation of positive from negativephotographs. Fig. S is a section of this frame. Both of these frames, figs. 6 and 7r
Photography · Art and photography
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