390 



Astronomical and Nautical Collections. 



Delambre's Example. {Astr. Coll. No. 5.) 

 h zz 42° 14' 9", A' == 16° 5' 47" 

 i)= 8° 16' 30", d = 8° 15' 

 t = 22° 30' 



Sin/( 

 sin A' 



C72184 (1) 

 277244 (2) 



sin X = 48° 53' 5" 9.877018 



cos X =1= 53° 3' 3" 9.778951 (13) 

 p— a:=28 Oil 



Correction. 



sin y 

 COS. X 



9.7172 

 A.C. 0.1821 



D — d = 90' 



2.073 



sin s 



sin t A.C. 



2.073 



9.8993 

 0.4172 



0.3165 



186.57 = 2' 47" 

 48 53 5 



48 50 18 



Exceeding the truth by 18" only. 



iii. Apology for the Postscript on Refraction, in answer to 



Mr. Ivory's Remarks. 



A mathematician of Mr. Ivory's acknowledged celebrity and 



transcendent attainments might naturally be expected, like the 



Midas of antiquity, to convert whatever he touches into gold : 



