Bromide paper : instructions for contact printing and enlarging (1896)
Just, E. A · Bradford : P. Lund, Humphries · leaf 137
COMM ERCIAL APPARATUS. also used by S. Plossl and Co., for their excellent projecflion apparatus, in which a magnesium pencil may be used instead of zircon. The magnesium stump does not crumble away as is sometimes the case with the small zircon plate. HOME-MADE ENLARGING ARRANGEMENTS. If…
Photography
Internet Archive · Getty Research Institute · Public domain (published before 1931). Free to use for anything.
