Photography with emulsions: a treatise on the theory and practical working of gelatine and collodion emulsion processes (1882)
Abney, William de Wiveleslie, Sir, 1843-1920 · New York, Scovill manufacturing co. · leaf 36
plate supported by them. For summer weather, when the air is, as a rule, dry, it is a good plan to have a small gas jet placed just above the box in the iron gas tube. This heats the air in the zinc tube, and a draught is created through the box; by this means the air is not above the summer… … Fig. 4. made, and consists of a box of thick wood, on the top of which is a zinc pipe to connect it with a chimney. At the bottom is another pipe, but with an elbow to prevent light from entering. Horizontal shelves are placed in the interior, so that the current of air obtained by the draught in…
Photography
Internet Archive · Getty Research Institute · Public domain (published before 1931). Free to use for anything.
