Adams, John D. (John Duncan), 1879- · Chicago : Popular Mechanics Co · leaf 52
46 METAL WORK AND ETCHING case will prove a very simple matter, and whichever of the previously described coloring or oxidizing so- lutions is employed, be sure to have at least the cen- tral portion of the reflecting plate rubbed up bright and evenly lacquered. If it is desired to make an electric… … the drip tray should be dispensed with and an ordi- nary electric socket set up in place. This should then be completely boxed in with thin pieces of wood, through which the operating key will project. The top of this small concealing box should not be less than % in. thick, and project over the…
Metal-work · Etching
Internet Archive · Getty Research Institute · Public domain (published before 1931). Free to use for anything.
