Vol. 40. 



November 1812. 



No. 175. 



PHILOSOPHICAL MAGAZINE 



COMPREHENDING 



GEOLOGY, 

 THE VARIOUS BRANCHES OF SCIENCE, 



THE LIBERAL AND FINE ARTS, 



AGRICULTURE, 



MANUFACTURES AND COMMERCE. 



NUMBER CLXXV. 

 For NOVEMBER 1812. 



CONTAINING THE FOLLOWING ENGRAVINGS: 



II. Figures to illustrate such Poitions of a Sphere as have their i 

 Attraction expressed by an algebraic Quantity. — Van Hel-I 

 mont's Differential Thermometer. 



'i. Formation of Ovals for Gardeners. \Wk 



.. ., .... . ■„, . -, — ., ■■ I ly,... ...,,. Ill, 



BT ALEXANDER TILLOCH, 



M.B.I. A. F.S.A. EDIN. AND PERTH, &C. 



LONDON: 



PRINTED Bit RICHARD TAYLOR AND CO., SHOE LANE: 



jAndsold by Richardsons; Cadell and Davies; Longman, 

 Hurst, Rees,Ormb & Brown; Murray; Highley; Sher-{ 

 WOOD and Co.; Harding; London: Constable and Co. 

 Edinburgh: Brash and Reid, and D. Niven, Glasgow: 

 and Gilbert and Hodges, Dublin. 



fle^ 



