Sure and easy development of plates and films (1904)
Hinton, A. Horsley (Alfred Horsley), 1863-1908 · London : Hazell, Watson & Viney · leaf 46
40 Sure and Easy Development of and having put sufficient developer of the highly diluted variety into a tank or other vessel, I drop the clip and its dependent film (see diagram 5) into the developer. The clip floats on the No. 5 surface, and so keeps the film vertically suspended below it. As… … No. 6 dish, or anything which will exclude the light, until such time as it is thought desirable to inspect the films and see how they are progressing. You are then able to lift the films out one by one, without touching them with your fingers, lifting each^out by
Photography · Photography -- Developing and developers
Internet Archive · Getty Research Institute · Public domain (published before 1931). Free to use for anything.