Plain directions for obtaining photographic pictures upon waxed and albumenised paper and glass, by collodion and albumen : including a third edition of Le Gray's Treatise on photography, a description of the stereoscope and the manner of taking pictures suited for it : also, the process for copying microscopic objects, &c. (1852)
Heisch, Charles, editor, Le Gray, Gustave, 1820-1884. Nouveau traité théorique et pratique de photographie sur papier et sur verre. English · London : T. Willats · leaf 72
e case, divide the ground glass of the cameras by pencil lines into a number of squares of about a quarter inch in size, and draw diagonal lines across the glass so as to mark its centre ; by now observing how many of the squares are occupied by the object to be copied, and precisely the spot which… … To avoid the trouble of drawing the lines on which to place the cameras every time they are wanted, the stand may be marked with a number of lines shewing the positions of the cameras for objects at different distan¬ ces ; the figure 10 will serve to explain this : — Let A B C D be the board on…
Photography · Collodion process
Internet Archive · Getty Research Institute · Public domain (published before 1931). Free to use for anything.
