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 … moved to adjust the focus. This sliding-frame includes four other frames, corres- ponding to the size of each plate, as madeso to fit one within the other, and eachbearing on the rabbet of the larger one.These frames are shown at fig. 2. Whenyou wish to operate on large plates, takeout such of the…
Photography · Art and photography
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