The silversmith's handbook : containing full instructions for the alloying and working of silver, including the different modes of refining and melting the metal; its solders; the preparation of imitation alloys... (1921)
Gee, George E. (George Edward) · London : Crosby Lockwood and Son · leaf 49
harge, carbonate of soda, borax,and charcoal. These four substances are all thatare required by the practical assayer in the treat-ment of the regular ores of silver. The assaying of the genuine ores is performedin the following manner; that is,if they contain but little earthymatter. They may then… … Fig. 2. Fire-clayCrucible. l?e as follows MELTING IN A CRUCIBLE. 17 in its greatest diameter, which should be at thetop. A quantity of litharge (a semi-vitrious sub-stance, oxide of lead), more than is actually neces-sary to take up the whole of the silver in the ore,should be added, so as to…
Silverwork
Internet Archive · Smithsonian Libraries · Public Domain Mark 1.0. Free to use for anything.
