A Manual of Practical AssayingLongmans, Green, and Company, 1868 - 697 páginas |
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Página 9
... removed as carefully as possible , and then the specimen crushed into coarse pieces on a sheet of clean paper . By means of a pocket magnifier and a pair of pincers , clean , typical pieces of the mineral are then to be selected for ...
... removed as carefully as possible , and then the specimen crushed into coarse pieces on a sheet of clean paper . By means of a pocket magnifier and a pair of pincers , clean , typical pieces of the mineral are then to be selected for ...
Página 19
... removed , when the water will flow out until it is level with the immersed end of the syphon . Fresh water can then be added , the powder stirred up again , and the operation of decantation by the syphon carried on as long as requisite ...
... removed , when the water will flow out until it is level with the immersed end of the syphon . Fresh water can then be added , the powder stirred up again , and the operation of decantation by the syphon carried on as long as requisite ...
Página 21
... removed by the finger , and made to run into a vessel placed below the scoop , in which all the water and matters carried off are received . This operation , however , must not be hurriedly performed , so as to mix the parts already ...
... removed by the finger , and made to run into a vessel placed below the scoop , in which all the water and matters carried off are received . This operation , however , must not be hurriedly performed , so as to mix the parts already ...
Página 22
... removed by the finger , as in the first described process . By careful repetitions of these processes , the whole , or nearly the whole , of the sandy and earthy matters may be removed , and the gold or other mineral left nearly pure ...
... removed by the finger , as in the first described process . By careful repetitions of these processes , the whole , or nearly the whole , of the sandy and earthy matters may be removed , and the gold or other mineral left nearly pure ...
Página 34
... removed from the pans , it should never be done without previously supporting them by these contrivances ; for the weight , if dropped in , descends with a force highly injurious to the supporting edges ; also if a large weight be taken ...
... removed from the pans , it should never be done without previously supporting them by these contrivances ; for the weight , if dropped in , descends with a force highly injurious to the supporting edges ; also if a large weight be taken ...
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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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