Vol. 10. DECEMBER 1880. No. 64, 



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



THE 

 LONDON, EDINBURGH, ato DUBLIN 



PHILOSOPHICAL MAGAZINE, 



AJSD 



JOURNAL OF SCIENCE. 



Being a Continuation of Tilloclis 'Philosophical Magazine? 

 Nicholson s ( Journal? and Thomsons '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. &c. 



AND 



WILLIAM FRANCIS, Ph.D. F.L.S. F.RA.S. F.C.S. 

 j> 



FIFTH SERIES. 



N° 64.—DECEMBER 1880. 



WITH TWO PLATES. 



Illustrative of Mr. W. H. Preece's Paper on the Space protected by a 

 Lightning-Conductor, and Dr. A. Macfaelane's on the Disruptive 

 Discharge o£ Electricity. 



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