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V. On the effect of the presence of metals and metalloids upon the electric conducting power of pure copper

1860; Royal Society; Volume: 150; Linguagem: Inglês

10.1098/rstl.1860.0006

2053-9223

Augustus Matthiessen, M. Holzmann,

Advanced Physical and Chemical Molecular Interactions

As the electric conducting power of copper varies so much according to different experimenters, we thought it would be of some interest to study the causes of these differences; and on comparing the values found for copper, we find that, taking silver = 100, copper conducts according to Becquerel* Riess† Lenz‡ Davy§ Christie§ Harris§ Buff|| Pouillet¶ Arndtsen** 95⋅3 67⋅2 73⋅4 91⋅2 66⋅0 100⋅0 95⋅4 73⋅0 98⋅7 The temperatures at which the above observations were made are only given in the cases of Becquerel, Lenz and Arndtsen, who compared copper at 0°C. with silver at 0°C. = 100. We prepared therefore pure copper,— 1. By precipitating with sulphuretted hydrogen the purest commercial sulphate of copper dissolved in water acidulated with sulphuric acid, dissolving the washed sulphide in nitric acid, precipitating at a boiling temperature by carbonate of soda in excess, and finally reducing the oxide of copper with pure hydrogen.