Vol.64. 



July 1824. 



No. 315. 



Published the Last Day of every Month. — Price 2s. 6d. 



THE 



PHILOSOPHICAL MAGAZINE 



AND JOURNAL: 



COMPREHENDING 



THE VARIOUS BRANCHES OF SCIENCE, 



THE LIBERAL AND FINE ARTS.. 



AGRICULTURE, MANUFACTURES, 



AND COMMERCE. 



NUMBER CCOXV. 

 For J U L V Ljg4, 



WETM A PL ATK 



Illttsir Mr S Staward's Hydro-Pneumatic Pump for 



compressing Gasqs. 



By ALEXANDER TILLOCH, LL.D. 



M.R.I. A. F.S.A. EDIN. AND PERTH; CORRESPONDING MF.MBFR OF THE KOYAl 



ACADEMY OF SCIENCES, MUNICH; AND OE THE ACADEMY OF SCIKNCF ;, 



LITERATURE AND ARTS, LEGHORN, ETC. 



And RICHARD TAYLOR, F.L.S. 



.MfM 1 H OF rHE fcSTRONOIUCAL SOCIETY OF LONDON, AND OF THE ASIATIC SOCIETY 

 OV I.RLAT BRITAIN .WD IRFIAMD. 



LON!) N 



PRINTED I'.', Hli'ilARI) TAYLOR, SHOE-LAW ! 



hyCadejl; Longman, II Orrae, Brown' and Green j Baldwin, 



lock, and Joy ; Highley; Sherwood, Jones, and Co.; Hording; Under- 

 wood; Siinpkin and Mar.liall ; London:— and by Constable and Co. h'din- 

 •enman, Glasgow. 



