The metal worker's handy-book of receipts and processes : being a collection of chemical formulas and practical manipulations for the working of all the metals and alloys including the decoration and beautifying of articles manufactured therefrom, as well as their preservation (1890)
Brannt, William T. (William Theodore), 1844- · Philadelphia : H. Carey Baird & Co. ; London : Sampson Low, Marston, Searle & Rivington · leaf 257
partially filled with Vienna lime to which, for cheapness sake, pulverized charcoal and coarse beech saw-dust may be added. A very practical form of tumbling drum, in which a change of position of the contents must constantly take place, is shown in Fig. 8. The drum A, of wood or iron, is obliquely… … ellipses, the walls of the drum being now raised (indicated by the dotted lines) and then lowered, so that the articles in the drum are in constant motion and rub against each other. According to another method, small articles of iron are first pickled with acid, then washed with boiling water,…
Metal-work · Metals
Internet Archive · Getty Research Institute · Public domain (published before 1931). Free to use for anything.
