Snelling, Henry Hunt, 1816-1897 · [New York : W.B. Smith] · leaf 17
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… … In the former edition of this work, a formof camera was described, which possessesmany advantages ; and even after yearspractice with various instruments, few havebeen altogether more successful. It is,therefore, here described in the languageI employed in 1841 :— A photographic camera should…
Photography · Art and photography
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