A complete treatise on the art of retouching photographic negatives : and clear directions how to finish & colour photographs (1898)
Johnson, Robert · London : Marion · leaf 207
ses the water to revolve round the tank, and is drawn o/f through the bottom by means of the syphon, so that the prints are kept constantly in motion, and have a continuous change of water. The prints are protected from any possibility of damage through the inflow and out- flow of water by means of… … The water-supply is attached to the upright arm shown in illustration, which is pierced with fine holes, causing water to spray out to the side, and the prints to travel continually in a circular motion. The water is let out by means of an overflow shown by perforated holes in illustration, so that…
Photography
Internet Archive · Getty Research Institute · Public domain (published before 1931). Free to use for anything.
