Photography with emulsions: a treatise on the theory and practical working of gelatine and collodion emulsion processes (1882)
Abney, William de Wiveleslie, Sir, 1843-1920 · New York, Scovill manufacturing co. · leaf 257
243 APPENDIX. half-inch size cut out. A short piece and a long piece are laid together, or a pair of lines ruled at right angles to one another on a board, and when the square of gummed paper is made to adhere beneath them, and then deftly folded over, two sides of the required frame // … were made. One more long, and one more short piece, similarly treated, completed the frame. Four-sheet card is what Mr. England recommends. When the strips are cut, we make about thirty of these frames in an hour. The plates are packed alternately back to back and face to face, in the latter case a…
Photography
Internet Archive · Getty Research Institute · Public domain (published before 1931). Free to use for anything.
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