The science and practice of photography : an elementary textbook on the scientific theory and a laboratory manual (1920)
Roebuck, John R. (John Ransom), 1876-1965 · New York ; London : D. Appleton and company · leaf 83
for instance — and change the shutter setting for each section, at the same time changing the stop so as to offset the change in time. On development all the sections should be uniform in density. If they are not the trouble is almost cer- tainly with the shutter, as the diaphragm can usu- ally be… … 41. The Stop. — The system of numbering ap- plied to stops requires a very detailed explana- tion. In the figure let ab represent the diaphragm in the lens through which the light passes to the plate
Photography
Internet Archive · Getty Research Institute · Public domain (published before 1931). Free to use for anything.
