Materia photographica : a treatise on the manufacture, properties, and uses of the substances employed in photography (1891)
Leaper, Clement J · London : Iliffe · leaf 233
221 MATERIA PH0T0GRAPHICA. Drying Oven. … This is an arrangement for drying precipitates, etc., at a temperature higher than that of the air. It consists of a chamber of copper or iron heated by gas, and provided with a regulator, which enables the temperature to he maintained at anything from 30°. C to 200° C. A thermometer is also…
Photography
Internet Archive · Getty Research Institute · Public domain (published before 1931). Free to use for anything.
