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 |
From inside the book
Results 1-5 of 9
Page 64
... grains would not be too much , if , for in- stance , the rock is quartz ; and it is also the most convenient amount , from the facility thus afforded in afterward calcu- lating the per - centage . Under circum- stances where we have to ...
... grains would not be too much , if , for in- stance , the rock is quartz ; and it is also the most convenient amount , from the facility thus afforded in afterward calcu- lating the per - centage . Under circum- stances where we have to ...
Page 70
... grains of the filings should be carefully weighed off , wrapped in paper , ( satin paper is the best , giving little ashes , ) to prevent small particles from being lost , and placed in the muffle furnace on the cupel , fig . 2. When ...
... grains of the filings should be carefully weighed off , wrapped in paper , ( satin paper is the best , giving little ashes , ) to prevent small particles from being lost , and placed in the muffle furnace on the cupel , fig . 2. When ...
Page 72
... grains are used in each , and the value of the gold is afterward given in carats fine , pure gold being reckoned at 24 carats fine . In this way an alloy containing 91.666 per cent . of gold will be 22 carats fine , or in other words ...
... grains are used in each , and the value of the gold is afterward given in carats fine , pure gold being reckoned at 24 carats fine . In this way an alloy containing 91.666 per cent . of gold will be 22 carats fine , or in other words ...
Page 83
... grains of the Ural Mountains , which contain about 80 per cent . The button is hammered flat , and proceeded with exactly as gold ores , the platinum . dissolving with the silver in nitric acid . But as it does not do so as easily as ...
... grains of the Ural Mountains , which contain about 80 per cent . The button is hammered flat , and proceeded with exactly as gold ores , the platinum . dissolving with the silver in nitric acid . But as it does not do so as easily as ...
Page 97
... grains , as lead ores ( galena , a sulphuret of lead is the most common ) are very heavy , and therefore are comparatively small in bulk . Three parts , or here six hundred grains , of black flux are mixed up with the powdered ore . A ...
... grains , as lead ores ( galena , a sulphuret of lead is the most common ) are very heavy , and therefore are comparatively small in bulk . Three parts , or here six hundred grains , of black flux are mixed up with the powdered ore . A ...
Other editions - View all
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.
Page 20 - RIFFAULT, VERGNAUD, and TOUSSAINT.— A Practical Treatise on the Manufacture of Colors for Painting : Comprising the Origin, Definition, and Classification of Colors; the Treatment of the Raw Materials ; the best Formulae and the Newest Processes for the Preparation of every description of Pigment, and the Necessary Apparatus and Directions for its Use ; Dryers ; the Testing, Application, and Qualities of Paints, etc., etc.
Page 10 - FAIRBAIRN.— The Principles of Mechanism and Machinery of Transmission • Comprising the Principles of Mechanism, Wheels, and Pulleys, Strength and Proportions of Shafts, Coupling of Shafts, and Engaging and Disengaging Gear. By SIR WILLIAM FAIRBAIRN, Bart CE Beautifully illustrated by over 150 wood-cuts.
Page 17 - FORMULAE for finding the Discharge of Water from Orifices, Notches, Weirs, Pipes, and Rivers. With New Formulae, Tables, and General Information on Rain-fall, Catchment-Basins, Drainage, Sewerage, Water Supply for Towns and Mill Power. By JOHN NEVILLE, Civil Engineer, MRIA Third Edition, carefully revised, with considerable Additions.
Page 6 - TRAMWAYS: THEIR CONSTRUCTION AND WORKING. Embracing a Comprehensive History of the System ; with an exhaustive Analysis of the Various Modes of Traction, including Horse Power, Steam, Cable Traction, Electric Traction, &c.
Page 21 - ROSE.— The Complete Practical Machinist : Embracing Lathe Work, Vise Work, Drills and Drilling, Taps and Dies, Hardening and Tempering, the Making and Use of Tools, Tool Grinding, Marking out Work, etc.
Page 14 - LANDRIN.— A Treatise on Steel: Comprising its Theory, Metallurgy, Properties, Practical Working, and Use. By MHC LANDRIN, Jr., Civil Engineer. Translated from the French, with Notes, by AA FESQUET, Chemist and Engineer. With an Appendix on the Bessemer and the Martin Processes for Manufacturing Steel, from the Report of A bram S.
Page 2 - Marble Worker's Manual: Containing Practical Information respecting Marbles in general, their Cutting, Working and Polishing ; Veneering of Marble ; Mosaics ; Composition and Use of Artificial Marble, Stuccos, Cements, Receipts, Secrets, etc., etc. Translated from the French by ML BOOTH. With an Appendix concerning American Marbles. I2mo., cloth $1.50 BOOTH and MORFIT.— The Encyclopaedia of Chemistry, Practical and Theoretical : Embracing its application to the Arts, Metallurgy, Mineralogy...
Page 25 - Artificial Manures : Their Chemical Selection and Scientific Application to Agriculture. A series of Lectures given at the Experimental Farm at Vincennes, during 1867 and 1874-75. By M. GEORGES VILLE. Translated and Edited by WILLIAM CROOKES, FRS Illustrated by thirty-one engravings. 8vo., 450 pages ...... $6.00 VILLE.
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.