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disposal all his alloys ; and in the following Table I will give the 

 results of the analyses and redeterminations of the conducting power 

 of his set. The wires were in some cases very faulty, so that I was 

 obliged to draw them finer ; others drew so badly, that the values ob- 

 tained could not very well agree with those already published. After 

 having measured their resistances, I sent them back to Prof. Thom- 

 son for redetermination. Table I. gives the results so obtained, 

 taking the alloy containing 99*75 copper and '25 silver =100; and 

 Table II. the values found for some specimens of pure copper : 



TABLE I. 



* Compared with a hard-drawn gold-silver wire of equal diameter, and length, 

 whose conducting power is equal at C. to 100, these values would be 603-7 

 and 600-5. (See my paper "On an Alloy which may be used as a Standard of 

 Electrical Resistance," Phil. Mag. Feb. 1861.) 



