Lantern slides : how to make and color them (1895)
Elmendorf, Dwight L. (Dwight Lathrop), 1859-1929 · New York : E. & H.T. Anthony & Co. · leaf 23
17 Hyposulphite of soda. 5. Powdered alum. 6. Red prussiate of potash. All of these articles may be obtained from the publishers, and all except the developer may be obtained anywhere. Formulas for developers will be given later. Each article will now be described in detail. 1. The most convenient… … Next in value is a gas-jet, controlled by a ratchet device and lighted by an electric spark. One pull of the pendant chain turns on the gas and lights it at the same time. A second pull shuts off the gas, and, of course, extinguishes the light.
Slides (Photography)
Internet Archive · Getty Research Institute · Public domain (published before 1931). Free to use for anything.
![An illustration from [Trade Catalogue] A collection of illustrated and priced catalogues : [6 catalogues in 1 vol.] (1893)](https://img.insideoutlibrary.com/img/200/erara-29962077-278-1.webp)
