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Various Fluxes

Borax, tartar, nitre, sal-ammoniac, common salt, limestone, , sal -ammoniac, common salt, limestone, glass, fluorspar , resin, and several other substances are used as fluxes in fusing metals, and soldering . On the large scale crude tartar is employed. (See No. 3472.) ing must be done in a copper vessel. alloy of 2 parts tin to 1 part lead, fusible at