7oL. 



Published tJie Last Day of every Month, 

 [PRICE 28. 6d.] 



THE 



PHILOSOPHICAL MAGAZINE 

 AND JOURNAL: 



COMPRBUeiXDIKG 



THE VARIOUS BRANCHES %0F SCIENCE, 

 THE LIBERAL AND FINE ARTS, 

 GEOLOGY,' 

 AGRICULTURE, 

 ' MANUFACTURES AND CO&IMERCE. 



NUMBER CCXXIX.. 

 For MJ Y 1817. 



CONTAINING A PLATE ENGRAVED BY PORTER, 

 O^viiptive of Mr. Emmett's Instrurne-'Ufor the Measurement 

 f^tlie Moon's Distance from the Sua, &c.; also a New Reflect- 

 '"; Goniometer. . 



BY ALEXANDER TILLOCfl, 



=»**i 



Ujn.I.A.F.S.A. EDI*, AND rEllTII, PPC. 



LONDON: 



':«S| fai\T£D at EICUAKO AKD ARTHUR TAYIOK; SHOE LAWB: 



And 



I sold by CADBtt. and Davies ; Longman, Hurst, Rees, 



>«ME, & BrOWIT) MuRRAYJ HlOHLETi Sh£RWOOU and Co.; 



^ifV Hakdiko; Umdervood; Simpkix and Marshall ; London: 

 CoKSTABLB and Co. Edinburgh : Bhash and Reid ; Dun- 

 <?ah; and Penman, Glasgow : and Gilbbrt and irluDuss, 

 Dublin. 



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