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 the Principal Metals, of Gold and Silver Coins and Alloys, and of Coal, &c |
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Page 21
... remarked , through e . On inserting the bars and muffle , the parts where they meet , and where the former touch the other bricks , should be powdered over with bone - ashes , to prevent a possible adhesion from the intense heat . Small ...
... remarked , through e . On inserting the bars and muffle , the parts where they meet , and where the former touch the other bricks , should be powdered over with bone - ashes , to prevent a possible adhesion from the intense heat . Small ...
Page 26
... remarked , though easily constructed , are not portable ; and it is proper that , before closing this chapter , I should devote a few lines to the mention of those , which , from their being movable , and thus obviating the difficulty ...
... remarked , though easily constructed , are not portable ; and it is proper that , before closing this chapter , I should devote a few lines to the mention of those , which , from their being movable , and thus obviating the difficulty ...
Page 49
... remarked , is not perfectly pure , chemically speaking , but the slight impu- rities are too insignificant to deserve any attention from an assayer , who has nothing but technical purposes in view , though they might require it from a ...
... remarked , is not perfectly pure , chemically speaking , but the slight impu- rities are too insignificant to deserve any attention from an assayer , who has nothing but technical purposes in view , though they might require it from a ...
Page 83
... remarked , that it is neces- sary to add a little more lead for cupella- tion , than would be done if no platinum were in the ore ; and also , that just before the bright flash of light occurs during the operation of quartering , it is ...
... remarked , that it is neces- sary to add a little more lead for cupella- tion , than would be done if no platinum were in the ore ; and also , that just before the bright flash of light occurs during the operation of quartering , it is ...
Page 89
... care taken by the assayer . If well managed , however , as here directed , he can hardly fail to be suc- cessful . The button , as remarked above , may vary in purity . It generally contains some iron , 8 * ASSAY OF COPPER ORES . 89.
... care taken by the assayer . If well managed , however , as here directed , he can hardly fail to be suc- cessful . The button , as remarked above , may vary in purity . It generally contains some iron , 8 * ASSAY OF COPPER ORES . 89.
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Common terms and phrases
A. A. FESQUET added alloy American amount of silver antimony Appendix aqua regia Architect ascertain assay assayer black flux Boilers borax BRANNT brick button BYRNE Calculating carats carbon charcoal Chemical Chemist and Engineer Chemistry chloride Civil Engineer clay cloth Coal Coins Colors Complete Practical Comprising Construction Containing copper Cotton crucible cupels Distillation Dyeing edition employed Fabrication Formulæ Franklin Institute French gineer Hand-Book heat HENRY CAREY Hessian Hessian crucible I2mo Illustrated inch Instructions iron JOSHUA ROSE latter litharge Louis coined Manufacture Mechanical melting mercury metal Metallurgy method Minerals Mining mixed muffle furnace muriatic acid necessary nitric acid numerous oxide per-centage peroxide piece platinum Pound powdered Practical Treatise procured produced Professor pure lead pure silver quantity quartz quicksilver Receipts retort Royal Rules Sheet-Iron slag specific gravity Steam Steam-Engine Steel sulphur sulphuret Tables tains tion tongs Translated various Varnishing weight wet processes WILLIAM wood engravings
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