Vol. 26. 



LONDON, EDINBURGH, and DUBLIN 



PHILOSOPHICAL MAGAZINE, 



AND 



JOURNAL OF SCIENCE. 



Being a Continuation of Tilloctis 'Philosophical Magazine,' 

 Nicholson s 'Journal,' and Thomson's 'Annals of Philosophy J* 



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.R.A.S. F.C.S. 



FIFTH SERIES. , 



No 163.— DECEMBER 1888. 



WITH TWO PLATES. 



Illustrative of Mr. J. Brown's Paper on Figures Produced by Electric 

 Action on Photographic Dry Plates. 



LONDON: 



PRINTED BY TAYLOR AND FRANCIS, RED LION COURT, FLEET STREET. 



Sold by Longmans, Green, and Co. ; Kent and Co. ; Simpkin, Marshall, and Co. ; 

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

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

 New York : — Veuve J. Boyveau, Paris : — and Asher and Co., Berlin. 



