Modern printing processes : gum bichromate and platinotype papers (1900)
Abbott, Henry G., 1858-1905 · Chicago : Geo. K. Hazlitt · leaf 33
MODERN PRINTING PROCESSES. 29 time that any ordinary printing-out paper will. An ordinary negative will print, say, in three minutes in the sun on a bright day. It will not do, however, to guess at it, for much depends on the length of the printing, for if we print … The Actinometer Back and correctly. It may want a Front . little more or a little less, depending on the color used. A few experiments will determine the right exposure. The actinometer is a simple instrument used for comparative timing. See the accompanying illustration. It is very simi- lar to an…
Photography
Internet Archive · Getty Research Institute · Public domain (published before 1931). Free to use for anything.
