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 15
... the Impurities of Commercial Zinc , with special reference to the residue insoluble in dilute acids , to Sulphur , and to Arsenic . The Corresponding Secretary presented , from the authors , the OF ARTS AND SCIENCES . 15.
... the Impurities of Commercial Zinc , with special reference to the residue insoluble in dilute acids , to Sulphur , and to Arsenic . The Corresponding Secretary presented , from the authors , the OF ARTS AND SCIENCES . 15.
Página 53
... 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 sulphate of soda ...
... 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 sulphate of soda ...
Página 54
... acid , and a trace of gold was detected in the residue described on p . 59 . * Loc . cit . ↑ Loc . cit . ↑ Brightly's Dig . Laws U. S. , for Standard , Title Coinage , § 3 ; for Weights , Title Coinage , § 13 . See our Memoir in Mem ...
... acid , and a trace of gold was detected in the residue described on p . 59 . * Loc . cit . ↑ Loc . cit . ↑ Brightly's Dig . Laws U. S. , for Standard , Title Coinage , § 3 ; for Weights , Title Coinage , § 13 . See our Memoir in Mem ...
Página 55
... acid which is used to excite the reaction . ― The method of analysis employed was as follows . The coin having been dissolved in moderately strong , pure , nitric acid , the cooled solu- tion was treated with an excess of a solution of ...
... acid which is used to excite the reaction . ― The method of analysis employed was as follows . The coin having been dissolved in moderately strong , pure , nitric acid , the cooled solu- tion was treated with an excess of a solution of ...
Página 56
... acid has been driven off , that is , until fumes of sulphuric acid are no longer perceptible . The necessity of thoroughly evapo- rating this mixture cannot be too strongly insisted upon , for a solution of gold in sulphuric acid is ...
... acid has been driven off , that is , until fumes of sulphuric acid are no longer perceptible . The necessity of thoroughly evapo- rating this mixture cannot be too strongly insisted upon , for a solution of gold in sulphuric acid is ...
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