Snelling, Henry Hunt, 1816-1897 · [New York : W.B. Smith] · leaf 168
Fig. 1 represents the camera, into whicha movable frame, A B C D, slides paral-lel with the sides of the box from one endto the other by means of four ledges, E FG iJ, firmly fixed at each of the four an-gles of the frame. These ledges suffice tomaintain the parallelism when the frame is
Photography · Art and photography
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