Proceedings of the American Academy of Arts and Sciences, Volumen2;Volumen5Metcalf and Company, 1862 Vol. 12 (from May 1876 to May 1877) includes: Researches in telephony / by A. Graham Bell. |
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Página 52
... Silver Coins . From our experiments upon the impurities of commercial zinc , * we found that this metal almost invariably contains lead . In the preparation of silver at the United States Mint , zinc is used for the purpose of reducing ...
... Silver Coins . From our experiments upon the impurities of commercial zinc , * we found that this metal almost invariably contains lead . In the preparation of silver at the United States Mint , zinc is used for the purpose of reducing ...
Página 53
... silver in nitric acid became blue when neutralized with ammonia . The filtrate from the mixed precipitate of sulphate of lead and gold ( see p . 56 ) contained a decided trace of copper and a fainter trace of iron . The solution of ...
... silver in nitric acid became blue when neutralized with ammonia . The filtrate from the mixed precipitate of sulphate of lead and gold ( see p . 56 ) contained a decided trace of copper and a fainter trace of iron . The solution of ...
Página 54
... silver . Our memoir , already cited , gives the per cents of lead found in two specimens of Vieille Montagne zinc . The standard of the American silver coin is silver and copper , and the weight of fifty cents ' worth of this alloy , in ...
... silver . Our memoir , already cited , gives the per cents of lead found in two specimens of Vieille Montagne zinc . The standard of the American silver coin is silver and copper , and the weight of fifty cents ' worth of this alloy , in ...
Página 55
... silver was no longer precipitated , care being taken to avoid adding an unnecessary excess of chloride of am- monium . It will be seen , that the chloride of silver was thus pre- cipitated in presence of a large excess of nitrate of ...
... silver was no longer precipitated , care being taken to avoid adding an unnecessary excess of chloride of am- monium . It will be seen , that the chloride of silver was thus pre- cipitated in presence of a large excess of nitrate of ...
Página 56
... silver which had been dissolved by the nitrate of ammonia , with the intention of determining the lead directly , by precipitating it as sul- phate from this solution after evaporation with sulphuric acid . It was found , however , that ...
... silver which had been dissolved by the nitrate of ammonia , with the intention of determining the lead directly , by precipitating it as sul- phate from this solution after evaporation with sulphuric acid . It was found , however , that ...
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