Vol. 10. AUGUST 1880. No. 60. 



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



THE 

 LONDON, EDINBURGH, and DUBLIN 



PHILOSOPHICAL MAGAZINE, 



AKD 



JOURNAL OF SCIENCE. 



Being a Continuation of Tilloch's 'Philosophical Magazine,' 

 Nicholson's 'Journal,' and Thoinson's 'Annals of Philosophy.'' 



CONDUCTED BY 



SIR ROBERT Ej&TE, LL.D. F.R.S. M.R.I.A. F.C.S. 

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



AKD 



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



FIFTH SERIES. 



N° 60.— AUGUST 1880. 



WITH TWO PLATES. 



Illustrative of Mr. W. Baxly's Paper on the Vibrations of a Film in 

 reference to the Phoneidoscope, and Mr. E. H. Liteing's on the Detec- 

 tion and Measurement of Inflammable Gas in Mines. 



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