/ 



7ol. 22. NOVEMBER l»lirV No. 131 



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



THE 

 LONDON, EDINBURGH, and DUBLIN 



PHILOSOPHICAL MAGAZINE, 

 JOURNAL OF SCIENCE. 



Being a Continuation of TillocKs ' Philosophical Magazine, 1 

 Nicholson's 'Journal/ and Thomson s 'Annals of Philosophy.' 



CONDUCTED BY 



SIR OLIVER JOSEPH LODGE, D.Sc, LL.D., F.R.S. 



SIR JOSEPH JOHN THOMSON, M.A., Sc.D., LL.D., F.R.S. 



JOHN JOLY, M.A., D.Sc, F.R.S., F.G.S. 



GEORGE CAREY FOSTER, B.A., LL.D., F.R.S. 



WILLIAM FRANCIS, F.L.S. 



SIXTH SERIES. 



N° 131.-4NOVEMBER 1911. 



WIT|[ FOUR PLATES. 



Illustrative of Prof. E. Taylob Jones and Mr. D. E. Eoberts's Paper on 

 the Induction-Coil ; and! Dr. H. "Wilde's on the Origin of Cometary 

 Bodies and Saturn's Ein£s. 



LONDON: 



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Sold by Simpkin, Marshall, Hamilton, Kent, and Co., Ld. : — Smith and Son, 

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