Vol.7. JUNE 1879. No. 45. 



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 Tilloch's i Philosophical Magazine/ 

 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. Ac. 



AND 



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



FIFTH SERIES. 



N° 45.— JUNE 1879. 



WITH A PLATE. 



Illustrative of Mr. D. Brown's paper on the Maintenance of Constant 

 Pressures and Temperatures. 



LONDON: 



PBINTBD BY TAYLOR AND FRANCIS, BED LION COURT, FLEET STREET, 



Sold by Longmans, Green, Eeader and Dyer j Kent and Co. 5 Simpkin, Marshall and 

 Co. ; and Whittaker and Co. ;— and by A. and C. Black, and Thomas Clark, Edin- 

 burgh ; Smith and Son, Glasgow : — Hodges, Foster, and Co., Dublin : — Putnam, 

 New York : — and Asher and Co., Berlin. 



