Handbook of the practice and art of photography (1875)
Vogel, Hermann Wilhelm, 1834-1898, Molling, Edward F · Philadelphia, Benerman & Wilson · leaf 289
lly non-actinic. By spectral photography, the author further was enabled to make studies on the striking changes in the transparency of our atmosphere, for chemical actinic light of different colors (see February number, 1874, Photo. Mittheil.) ; further, about the effect which the different… … tube, draw a sleeve attached to the camera over the tube to make it light-tight, and pull the ocular, 0, out a little way ; this produces the picture of the spectrum on the ground-glass. If sunlight falls on the slit, and it is sufficiently narrow, the dark lines can be seen. The nar- rower the…
Photography
Internet Archive · Getty Research Institute · Public domain (published before 1931). Free to use for anything.
