Vol.9. JANUARY 1880. No. 53. 



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



THE 

 LONDON, EDINBURGH, and DUBLIN 



PHILOSOPHICAL MAGAZINE, 



AND 



JOURNAL OF SCIENCE. 



Being a Continuation of TillocKs 'Philosophical Magazine? 

 Nicholson's 'Journal? and Thomson's l 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° 53.— JANUARY 1880. *° /jt <s : 



WITH THREE PLATES. 



Illustrative of M. G-. Wiedemann's Paper on Torsion and Frederick 

 G-uthrie's on certain Vibrations of Solids. 



1ED LION COURT, FLEET STREET, 



Kent and Co. ; Simpkin, Marshall and 



<g and C. Black, and Thomas Clark, Edin- 



Chap. ___ a._^3T (Jf », Foster, and Co., Dublin: — Putnam, 



LIBRARYOF^ CONGRESS. 



Chap. ._ r^L 

 Shelf 



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