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 26
... melt partially in the course of the process , and form ore compact mass . On the foregoing pages I have furnished descriptions and measurements of furnaces , which , as I have already remarked , though easily constructed , are not ...
... melt partially in the course of the process , and form ore compact mass . On the foregoing pages I have furnished descriptions and measurements of furnaces , which , as I have already remarked , though easily constructed , are not ...
Page 43
... melting of the lead , and to produce a good slag . When much tin , zinc , or lime is present in the ore , the borax should be increased in quantity up to the largest amount before mentioned . If we desire to test ores containing very ...
... melting of the lead , and to produce a good slag . When much tin , zinc , or lime is present in the ore , the borax should be increased in quantity up to the largest amount before mentioned . If we desire to test ores containing very ...
Page 44
... melting of the lead , we place some pieces of well - dried charcoal , which should always be kept on hand , in front of the crucibles . Vapours will be observed to be emitted , caused by the discharge of volatile substances . The door ...
... melting of the lead , we place some pieces of well - dried charcoal , which should always be kept on hand , in front of the crucibles . Vapours will be observed to be emitted , caused by the discharge of volatile substances . The door ...
Page 45
... melting varies much according to the character and quality of the ore , which sometimes , though rarely , may even require something more than half an hour . Gene- rally much less time is wanted with a good fire , and the assayer can ...
... melting varies much according to the character and quality of the ore , which sometimes , though rarely , may even require something more than half an hour . Gene- rally much less time is wanted with a good fire , and the assayer can ...
Page 47
... melting point than when it contains even a very small admix- ture of lead ; and for this reason , if we do not instantly elevate the temperature when the ceasing of the rainbow colours and the bright light of the globule of pure silver ...
... melting point than when it contains even a very small admix- ture of lead ; and for this reason , if we do not instantly elevate the temperature when the ceasing of the rainbow colours and the bright light of the globule of pure silver ...
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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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