Snelling, Henry Hunt, 1816-1897 · [New York : W.B. Smith] · leaf 323
23 and is kept firm and steady in its place1by means of a semicircular band of ironpassing through a groove in the upperportion or head of the screw, which isflattened for the purpose. This bandalso serves to fix the position of thecamera at any inclination desired. Theelevating screw is set in…
Photography · Art and photography
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