Robinson, H. P. (Henry Peach), 1830-1901, author, Abney, William de Wiveleslie, Sir, 1843-1920, author, Piper & Carter, publisher · London : Piper & Carter · leaf 77
und may often be entirely eliminated from the print. Proceed in this way : Take a print of the portrait, and cut out the figure in such a way as to get rid of the defective background, and then place this on a piece of thick card (we prefer a thick card, since it will not sag easily, and thus alter… … Fig. 23. aperture corresponds to the figure on the negative, and tack it on to the frame. The dotted lines (fig. 23) show the card * This calculation is near enough for our purpose. There are certain niceties which might he introduced, such as the “ critical angle of the glass.” F
Photography
Internet Archive · Getty Research Institute · Public domain (published before 1931). Free to use for anything.
