Snelling, Henry Hunt, 1816-1897 · [New York : W.B. Smith] · leaf 17
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, … the lens being fitted into one brass tubesliding in another, like a telescope tube,the moveable part being adjusted by ascrew and rack. The mouth of the tubeis contracted, by which any adventitiousradiations are obstructed, and a brass shadeis adjusted to close the opening if required;the paper is…
Photography · Art and photography
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