Wilson's quarter century in photography : a collection of hints on practical photography which form a complete text-book of the art (1887)
Wilson, Edward L. (Edward Livingston), 1838-1903 · New York : E.L. Wilson · leaf 138
t B, and a vignetting diaphragm at C. The open side of the box being toward the lens suflficiently, shades the near side of the negative, and secures the transmission of all the light coming from that direction. The upright piece upon which the box A slides has a large oval hole cut out of it for…
Photography
Internet Archive · Getty Research Institute · Public domain (published before 1931). Free to use for anything.
