Vol.9. FEBRUARY 1880. No. 54 



Published the First Day of every Month. — Price 2s. Qd. 



THE 

 LONDON, EDINBURGH, and DUBLIN 



PHILOSOPHICAL MAGAZINE, 



AND 



JOURNAL OF SCIENCE. 



Being a Continuation of TillocJis 'Philosophical Magazine] 

 Nicholsons 'Journal] and Thomsons 'Annals of Philosophy.'' 



CONDUCTED BY 



SIR ROBERT KANE, LL.D. F.R.S. M.RI.A. F.C.S. 

 SIR WILLIAM THOMSON, Knt. LL.D. F.R.S. Ac. 



AND 



WILLIAM FRANCIS, Ph.D. F.L.S. F.R.A.S. F.C.S. 



FIFTH SERIES* \k^\So, 



\> & , ; 



N° 54.— FEBRUARY 1880. 



WITH A PLATE. 



Illustrative of Dr. J. A. Fleming's Paper on a new Form of Kesistance- 

 Balance adapted for comparing Standard Coils. 



LONDON: 



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