January 1821. 



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PHILOSOPHICAL MAGAZINE 

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NUMBER CCLXXIII. 

 For JAN VARY 1821. 



• PLATE 

 I Illustrative of Mess. (Ersted and Ampere's Electro-magnetic, 

 Experiments, and Mr. Perkins's Paper on the Compressibility ' 

 of Water. * 



BY ALEXANDER TILtOCH, 



fti.R.I.A. M.G.8. M.U.A.9. MUNICH, F.8.A, EDIN. AND PERTH, 

 M.S.E.I.N, OF FRANCE, &C. &C. &C. 



LONDON: 



PRINTED BY RICHARD AND ARTHUR TATLOR, SHOI-LANH : 



And sold by CADELLand Davies; Longman, Hurst, Rees, 

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 Underwood; SiMPKiNandMARSHALt; London: Constable 1 



and Ct». Edinburgh: Brash and Reid; Duncan; and Pes- 

 man, Glasf-ow; and Giubert and Hodgbs, Dublin. 



