A Manual of Practical AssayingLongmans, Green, and Company, 1868 - 697 páginas |
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Página 18
... less , but giving more accurately the amount of metal in the sub- stance submitted to assay . A knowledge of this fact is also very useful from another point of view ; suppose it were wished to separate in a speedy manner , as perfectly ...
... less , but giving more accurately the amount of metal in the sub- stance submitted to assay . A knowledge of this fact is also very useful from another point of view ; suppose it were wished to separate in a speedy manner , as perfectly ...
Página 32
... less than 1th of a grain is avoided by a very ingenious contrivance . Each side of the beam is equally divided into ten parts , and over the beam on either side is placed a sliding rod , as represented in the figure . The object of ...
... less than 1th of a grain is avoided by a very ingenious contrivance . Each side of the beam is equally divided into ten parts , and over the beam on either side is placed a sliding rod , as represented in the figure . The object of ...
Página 34
... less time than would be required were the weights added by guess . When a weight is put in which is assumed to be nearly equal to the substance to be weighed , the balance should be brought to a state of rest , and should then be ...
... less time than would be required were the weights added by guess . When a weight is put in which is assumed to be nearly equal to the substance to be weighed , the balance should be brought to a state of rest , and should then be ...
Página 36
... less so , since the upper strata contained a much larger proportion of water than the lead at the bottom , the ... less than that of sulphate of lead , it followed that if there were 1 lb. of water in the pailful of moist sulphate , the ...
... less so , since the upper strata contained a much larger proportion of water than the lead at the bottom , the ... less than that of sulphate of lead , it followed that if there were 1 lb. of water in the pailful of moist sulphate , the ...
Página 41
... less exact , so that great care ought to be taken at the commencement of the roasting . When the assay has been kept at a dull red heat for some time , and shows no signs of agglutination , the heat may be slightly increased ; at the ...
... less exact , so that great care ought to be taken at the commencement of the roasting . When the assay has been kept at a dull red heat for some time , and shows no signs of agglutination , the heat may be slightly increased ; at the ...
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Términos y frases comunes
added alloy ammonia amount antimony aqua regia arsenic ascertained assay bismuth black flux blowpipe boiling borax button calcined carats carbonate of soda carbonic acid cent charcoal chloride of silver clay cobalt colour combustion containing cooling copper Crown 8vo crucible cubic cubic centimetres cupel decomposed dilute dissolved Edition employed excess filter flame flask fluid fuel furnace fused fusible fusion gives glass globule gold grains grammes heat hydrochloric acid ignited inches iron lime liquid litharge manganese matter melted mercury metal method mineral mixed mixture muffle nickel nitrate nitric acid normal solution obtained operation Ounce oxide oxide of lead oxidising oxygen permanganate peroxide pipette placed plate platinum potash potassium powder precipitate produced proportion protoxide pulverised pure readily reduced roasting salt silica slag small quantity sodium specific gravity substance sulphate of lead sulphide sulphuric acid temperature thousandths tion tube vessel washed weight Woodcuts zinc
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