Bromide paper : instructions for contact printing and enlarging (1896)
Just, E. A · Bradford : P. Lund, Humphries · leaf 22
t rays, varying with the different portions of the exposed plate. An example will show the importance of these sources of error. With a plate lo in. by 8 in., the difference of the exposures on different parts of the plate at a distance of half a metre would be very marked. The proportionate… … Fig. I. must be observed, that the intensity of the exposure of a plane is proportional to the cosine of the angles of incidence of the rays of light. Accordingly the intensities would be in the following proportions : — At a distance of ^ metre 100 : 97 : 95-3 At a distance of i metre 100 : 99*3 :…
Photography
Internet Archive · Getty Research Institute · Public domain (published before 1931). Free to use for anything.
