. The Philosophical magazine; a journal of theoretical, experimental and applied physics. e numerical results obtained by Prof. (Proceedings of Roy. Soc. It^GO, x. p. 300), and those byDr. llolzmann and myself (Phil. Trans. 1860), on the conductingpower of copper and its alloys, made it somcAvhat necessary to re- 546 Royal Society ;— investigate the subject, in order to ascertain the cause of these dif-ferences. For this purpose Professor Thomson kindly placed at mydisposal all his alloys; and in the following Table I will give theresults of the analyses and redeterminations of the
. The Philosophical magazine; a journal of theoretical, experimental and applied physics. e numerical results obtained by Prof. (Proceedings of Roy. Soc. It^GO, x. p. 300), and those byDr. llolzmann and myself (Phil. Trans. 1860), on the conductingpower of copper and its alloys, made it somcAvhat necessary to re- 546 Royal Society ;— investigate the subject, in order to ascertain the cause of these dif-ferences. For this purpose Professor Thomson kindly placed at mydisposal all his alloys; and in the following Table I will give theresults of the analyses and redeterminations of the conducting powerof his set. The wires were in some cases very faulty, so that I wasobliged to draw them finer ; others drew so badly, that the values ob-tained could not very well agree with those already published. Afterhaving 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=IOO; andTable II. the values found for some specimens of pure copper;— Table * Compared with a hard-drawn gohl-silvcr wire of eciTial diameter and Icngtli,whose conducting jiower is ecjiial at C C. to 100, thcbc vahics would he COS/and eOQ-r). (See my paper On an Alloy which may he used as a Standard ofElectrical Resistance, Iliil. Mag. Fel). 18G1.) On the Electric Conducting Power of Copper and its Alloys. 547 Table II. Composition ac-cording toMessrs. Johnsonand Matthcy. Analyses of AUojr. Specific Conductivity. | Values found byProfessor Thomson. Valucs found bymyself. Published [RedeterminedValues. 1 Values. Fure copper elec-jtrotype fronjiMessrs. De la|Rue ! 107 at 9° 107-2 at 10° Ditto from |Messrs. Elking-tou and Co. .. • All not fused. 107-5 at 12- 105-9 at 10°-5 Ditto from .... i i .. .. 1037atl2^j 106-9 at 14° Ditto, my own. .\ ; .. .. .. .. 107-7 at 12^ 108-1 at 10° 1 1 All the above wires were hard-drawn. Ou looking at the above,we find that
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