518 On a Method for computing Magnetic Declination. 



(6^ O. BJWls 74O 5,.^ j^O 4.^ = 830 gf^ 



(7.) 88° 9' X 20" =29' 23" 



i4°55'x 1' = 14.' 55" 



44.' 18" 

 (8.) 180^-1° 37' + 14° 4'= 192° 27'. 



(9.) 32400 : 37037 : : 44' 18" : 50' 38". 



50' 38" X 88° 9'-J-10 = 7° 26'. 

 14°55' + 7°26' = 22°21'. 



(10.) 75° 5'^ : 1 10° : : 51° 29'^ : 4° 42'. 



90° : 4° 42' : : 7° 26' : 23'. 

 160° 43' — 23' =160° 20' : comp. 19° 40'. 



(11.) sine 74° 5' .... 998302 



sine 19°40' . . . . 952705 



sine 18° 53' .... 951007 



sine of comp. and rad. 19° 40' . . 1997390 

 tang, to comp. . . 74° 5' . . 945511 



\',^^ tang 73° 9' . . 1051879 



73° 9' + 22° 2l' = 95° 30' : comp. 84° 30'. 



sine to comp. 18° 53' . . . . 997597 

 sine to comp. 84° 30' .... 898157 



sine to comp. 84° 48' . . . . 895754 

 The complement to be used is 95° 12'. 



(12.) 



Sides. Angles. 



(13.) 77° 41' 27° 6' 



95° 12' 7° 23' 



172° 53' : 34° 29' : : 77° 41' : 15° 29'. 



7° 23' 

 15° 29' 



22° 52' W. 



