Vol.6. NOVEMBER 1878. No. 38. 



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



THE 

 LONDON, EDINBURGH, and DUBLIN 



PHILOSOPHICAL MAGAZINE, 



AND 



JOURNAL OF SCIENCE. 



Being a Continuation of Tilloclis 'Philosophical Magazine? r 

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



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. &e. 



AND 



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



FIFTH SERIES. 



*?1 





N° 38.— NOVEMBER 1878. & ^ 



WITH THREE PLATES. \ V>m 



Illustrative of Mr. T. G-ray's Paper on the Experimental Determination 

 of Magnetic Moments in Absolute Measure, and Prof. S. P. Thomp- 

 son's on Magnetic Figures illustrating Electrodynamic IleLations. 



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