plate with twelve seconds exposure, and the remaining half with six. Develop, fix and wash the same as for a dry plate (using the formula recommended by the maker of the plate you are using) and determine the correct exposure from this test. When making slides by reduction, the whole or any Slides… … The above illustration clearly shows how any one of the Folding Kodaks (except the Nos. 1 and 1A) may be utilized for slide making by reduction.
Photography
Internet Archive · Getty Research Institute · Public domain (published before 1931). Free to use for anything.