Snelling, Henry Hunt, 1816-1897 · [New York : W.B. Smith] · leaf 178
hepressure frame, placing above it a piece ofvery fine black cloth pasted on one side ofa thick sheet of glass ; then shut the frame,giving to the proof a slight pressure, beingcareful not to crack the proof*, after whichexpose it to the light. In order to follow its action, raise it byone corner… … Athenjeum Club, Pall Mall,25th May, 1852. tEAR Professor Wheat-stone.—Since I last hadithe pleasure of addressing?you on Binocular Perspec-tive,* it has occurred to me,as a useful sterj towardspractice, to collect together^|) in a tabular form, some of the mostlikely instances of duplication for…
Photography · Art and photography
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