Bromide paper : instructions for contact printing and enlarging (1896)
Just, E. A · Bradford : P. Lund, Humphries · leaf 126
a simple, smooth cut-out, not edged or bent, and only a little larger than if required for a contacf print. The mask is always placed nearer the lens, and therefore can only be small ; if made larger and moved nearer to the drawing-board the vignetting becomes hard and abrupt. The highest degree of… … Fig. 20. by means of a pendulum. A cardboard cut-out is, for instance, provided with a light frame if it be insufficiently stiff, and attached sideways to the upper arm of the metronome pendulum. An arrangement may also be made with a stiff pendulum suspended from the ceiling. Encasement for the…
Photography
Internet Archive · Getty Research Institute · Public domain (published before 1931). Free to use for anything.
