The Assayer's Guide: Or, Practical Directions to Assayers, Miners and Smelters, for the Tests and Assays, by Heat and Wet Processes, of the Ores of All Principal Metals, of Gold and Silver Coins and Alloys, and of Coal Etc
Henry Carey Baird, 1856 - 157 pages
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according accurate acid added alloy already amount amount of silver applied ascertain assay assayer Bismuth borax brick button calculate carbon chemical Chemistry clay closed coal coin collect common Complete consists contains contents copper course covered crucible cupels Directions drawing easily edition employed Engineer extract flux former furnace give given gold grains half hand heat Hessian hundred Illustrated immediately improvements inch introduced iron kind latter lead Leather loss mass means melting mercury metal method mineral mixed muffle necessary never nitric acid occur operation oxide performed piece placed Plate platinum Pound powdered Practical prevent procured produced pure quantity quartz quicksilver reduced remarked remove result retort round Rules seen shape shows silver slag solution specific gravity sufficiently sulphur sulphuret taken United various vary vessel volume washed weight whole