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 |
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accurate alloy amount of silver antimony applied aqua regia arsenic ascertain Assay of Gold assayer black flux borax brick button produced carats carbon charcoal chemical Chemistry cible cinnabar clay coal coin colour contains cooling copper covered cupels dissolving edition employed Engineer Engravings evaporating extract filtered fuel gangue-rock gramme heat HENRY CAREY Hessian crucible hundred grains Illustrated inch latter Leather litharge Louis coined melting mercury metal method mineral mixed mixture Moidore muffle furnace muriatic acid neces necessary nitric acid oxide particles per-centage piece placed Plate platinum potash Pound powdered Practical procured pulverized pure gold pure lead pure silver purity quantity quartz quicksilver red-heat remarked retort roasting round shape silver and gold slag solution specific gravity sufficiently sulphate of lead sulphur sulphuret tains Tanning Testoons tion tongs Treatise tube Utensils vapours vessel volume washed Water of crystallization weight wet processes