AVG. 18ig. 



No. 256. 



Published the Last Day of every Month, 

 [PRICE 2s. 6d.] 



\ 



f 



-1 



^1 



THE 



PHILOSOPHICAL MAGAZINE 

 AND JOURNAL: 



COMF£BIIENDING 



THE VARIOUS BRANCHES* OF SCIENCE, 



THE LIBERAL AND FINE ARTS, 



GEOLOGY, 



AGRICULTURE, 



MANUFACTURES AND COMMERCE. 



NUMBER CCLVL 

 ■For AUGUST 1819. 



WITH AN ENGRAVING BY PORTER 



lUnstrative of Mr. Lowe's Description of a Mercurial ' 

 Pendulum, 



BY ALEXANDER TILLOCH, 



M.It.I.A. M.G.9. M.R.A.S. MUNicn, F.S.A. EDIN. ANDPEUTH, &C. 



.'? 



LONDON: 



PRI!<TEI>BV RtCHAHO AND ARTHUR TAYLOR, SHOE-LAWS : 



And sold by CADEtc and DAvies ;- Longman, Hurst, Rees, 

 Orme, fc Brown; Highley ; Sherwood aiidCo, ; HARDiKc:! 

 Undirwood; SiMPKiNan'd Marshal!, J London: Constablb I 

 and Co. Edinburgh: Brash and Reid; Duncanj and Pen- 

 man, XJlasgow: and Gilbert and Hodges, Dublin. 





