Vol.7. MAY 1879. No. 44. 



Published the First Day of every Month. — Price 2s. 6d. 



THE 

 LONDON, EDINBURGH, and DUBLIN 



PHILOSOPHICAL MAGAZINE, 



AND 



JOURNAL OF SCIENCE. I 



Being a Continuation of Tilloclis 'Philosophical Magazine,' 

 Nicholson s 'Journal,''' and Thomson s 'Annals of Philosophy.' 1 



CONDUCTED BY 



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

 SIR WILLIAM THOMSON, Knt. LL.D. F.R.S. &c. 



AND 



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





B Ox 



N° 44.-MAY 1879. % H II 



Illustrative of Dr. C. William Siemens's paper ou the Transmission 

 and Distribution of Energy by the Electric Current. 



is. \%\f% 



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