computing Magnetic Declination. 515 



sine 22'' 28' .... 958223 -i. 



sine 89° 23' ... . 999997 niP.lAh 



1958220 

 sine 43° 54' ... . 984098 



sine 33° 26' .... 974122 

 which is the angle bca. 



Inasmuch as the process for finding the values of the sides 

 and angles, and the corrections for the earth's rotundity in 

 latitude and longitude, is precisely identical when applied to 

 the southern hemisphere, it would be useless to repeat the 

 explanations and details of the process. But in order to faci- 

 litate the computation, and yet avoid repetition, corresponding 

 items shall be arranged under corresponding numbers. 



(6.) 38° 31'- 13° 29' = 25° 2'. 



(7.) 25° 2'x20"= 8' 20" 



14° 55' X 1' = 14' 55" 



23' 15" 



(8.) 180° + 20' +13° 29' = 193° 49'. 



(9.) 32400 : 37564 : : 23' 15" : 26' 57". 



26'57"x25°2'^10=:l° 7'. 

 14° 55'+ 1° 7'= 16° 2'. 



(10.) 75° 5'2 : 104° 55^ : : 51° 29'^: 49° 19'. 



90° :49° 19':: 1° 7' : 36'. 

 155° +36' =155° 36' : compl. 24° 24'. 



(11.) sine 38° 31' .... 979431 



sine 24° 24' ... . 961606 



sine 14° 54' . . . . 941037 



sine of comp. and rad. 24° 24' . . 1995937 

 tang, to comp. . . 38° 31' . . 1009914 



tang 35° 56' . . 986023 



35° 56 — 16° 2' =19° 54'. 



sine to comp. 14° 54' .... 998515 

 sine to comp. 19° 54' . . . . 997326 



sine to comp. 24° 41' ... . 995841 



The complement is 155° 19'. 



2 L 2 



