Spon, Ernest, Haldane, Robert, Lock, Charles G. Warnford (Charles George Warnford), 1853-1909 · London ; New York : E. & F.N. Spon · leaf 259
r has to be greatly where the metal is worked up. The increased. The first thing, therefore, proportion of silver present is ascer- done with the gold is to alloy it with tained by assay, and governs the market 3 times its weight of silver, which con- price per oz. of the commercial metal. tains a… … ing the silver and gold together in a lated alloy is introduced into a hemi- coke furnace. The alloy thus made is spherical cast-iron pot a, about 2 or " granulated," by ladling it out of the 2| ft. in diameter, which is heated by a melting-pots and pouring it into a vessel fire beneath, and…
Workshop recipes · Technology · Industrial arts
Internet Archive · Getty Research Institute · Public domain (published before 1931). Free to use for anything.
