Snelling, Henry Hunt, 1816-1897 · [New York : W.B. Smith] · leaf 17
focus of the lens, the image being observedthrough a small hole at e. & i Z e $ 13. A great variety of these instruments havebeen introduced to the notice of studentsof the art, many of them so unnecessarilyexpensive that they are beyond the reachof the humble amateur. It is conceivedthat a few… … the other for the purpose of adjusting thefocus, the lens being fitted into a brass tubewhich screws into the front of the camera.The wood-cut (Fig. 15) is but one box,
Photography · Art and photography
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