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 18
... clay , the same material as that used for the well - known Hessian crucibles , ( Plate II . fig 5. ) The one from which the drawing was taken in Plate I. measures eight inches across the bottom from mouth to back outside , and four ...
... clay , the same material as that used for the well - known Hessian crucibles , ( Plate II . fig 5. ) The one from which the drawing was taken in Plate I. measures eight inches across the bottom from mouth to back outside , and four ...
Page 20
... clay bar , o , which holds the muffle , ( vid . fig . 2. ) As seen in fig . 3 , this bar as well as the three others shown in the little sketch affixed to fig . 2 , and of which the centre one is a little the longest , are slightly ...
... clay bar , o , which holds the muffle , ( vid . fig . 2. ) As seen in fig . 3 , this bar as well as the three others shown in the little sketch affixed to fig . 2 , and of which the centre one is a little the longest , are slightly ...
Page 21
... clay . p , in fig . 2 , is the open space left round the muffle about an inch and a half wide , and into which the opening d in figs . 1 and 3 leads . Immediately below CD we have the door b exhibited in all three figures . It is for ...
... clay . p , in fig . 2 , is the open space left round the muffle about an inch and a half wide , and into which the opening d in figs . 1 and 3 leads . Immediately below CD we have the door b exhibited in all three figures . It is for ...
Page 22
... clay , an inch and a quarter thick , kept in place by iron rivets , thus protecting the assayer from the radiating heat of the iron , which would otherwise soon be white - hot . Below the grate stretches the chamber q , in figs . 2 and ...
... clay , an inch and a quarter thick , kept in place by iron rivets , thus protecting the assayer from the radiating heat of the iron , which would otherwise soon be white - hot . Below the grate stretches the chamber q , in figs . 2 and ...
Page 25
... clay . C is the channel leading off to the chimney D , which may vary in width from one half to one quarter the width of B. For assays of lead and copper it is not necessary to have the chimney very high , as no very severe draught is ...
... clay . C is the channel leading off to the chimney D , which may vary in width from one half to one quarter the width of B. For assays of lead and copper it is not necessary to have the chimney very high , as no very severe draught is ...
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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
Popular passages
Page 26 - ... Problems ; also, Practical and Simple Rules for Describing the various Patterns required in the different branches of the above Trades. By REUBEN H. WARN, Practical Tin-Plate Worker. To which is added an Appendix, containing Instructions for Boiler- Making, Mensuration of Surfaces and Solids, Rules for Calculating the Weights of different Figures of Iron and Steel, Tables of the Weights of Iron, Steel, etc.
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Page 1 - Long-Span Railway Bridges, comprising Investigations of the Comparative Theoretical and Practical Advantages of the various adopted or proposed Type Systems of Construction, with numerous Formulae and Tables giving the weight of Iron or Steel required in Bridges from 300 feet to the limiting Spans ; to which are added similar Investigations and Tables relating to Short-span Railway Bridges.