MAGNETIC OBSERVATIONS. 215 



AFTER BINNACLE COMPASS. 



= 1-1228 + 17-000.4, + 8.442^ 5.641 C, + 0.924 A + 0.383 A 

 o== 0.8724 + 8.442,4, + 8.310^, + 0.462 C l 1.205 A 4-543^, 

 o = 0.0346 5.641 A l + 0.462 l + 8.691 q + 3.900 Z' 4.438 E t 

 = 0-0385 + A + W C,') 

 o = + 0.0018 + E l + A C, + 0.0047 (A 2 c i 2 ) 

 Hence 



A t = -if- 0.0148 = -f-o 50'. 8 



-ff, = + 0.0947 = + 5 25.4 



C\ = 0.0073= 2 5- 2 



A= + 0-0340 = + i 57-1 



E l = 0.0012= o 4.1 



AFTER RITCHIE COMPASS. 



= 3-333 6 + i7-ooo A, + 8.442 , 5.641 C l + 0.924 A + 0.383 

 o 1.9499 + 8.442 A t + 8.310 J3i + 0.462 C t 1.205 A 4-543 EI 

 o = + 0.6086 5.641 A l + 0.462 BI + 8.691 C, + 3.900 Z>, 4.438 ^ 

 o = _ 0.0340 + A + i W C,*) 

 o = + 0.0008 + ., + Jf, C l 

 Hence 



^, = + 0.1684 = + 9 39'- 



A = + 0.0659 = + 3 46.6 



C l = + 0.0203 = + ! 9- 8 



A = + 0.0320 = + i 50. i 



JE l = 0.0021 = o 7.4 



AFTER AZIMUTH COMPASS. 



o = + 0.4916 + 17.000 A l + 8.442 BI 5.641 C l + 0.924 DI + 0.383 E 

 o = + 0.6880 + 8.442 AI + 8.310 B l + 0.462 C, 1.205 A 4-543 -^i 

 o = 0.2024 5-641 A l + 0.462 BI + 8.691 C, + 3.900 Z>, 4.438 t 

 o = 0.1116 + Z>, + i (? C^) 

 o = + 0.0002 + 1 + BI C^ 

 Hence 



^, = 0.0434 = 2 29'-3 



^, = 0.0199 = i 8.5 



C, = 0.0552 = 3 9.7 



D l = + 0.1129 = + ^ 28.2 



E^ = 0.0013 = 4-5 



FORWARD ALIDADE COMPASS. 



o = 1.0908 + 17.000 A l + 8.442 BI 5.641 C, + 0.924 Z>, + 0.383 EI 

 o = 0.4111 + 8.442 A t + 8.310 B^ + 0.462 (7, 1.205 Z>, 4-543 -^i 

 o = + 0.4058 5.641 A l + 0.462 BI + 8.691 C t + 3.900 Z>, 4-438 EI 

 o = - - 0.0235 + A + i (A 1 c - ! ) 



o = 0.0007 + A + A c, + 0.0125 W c i') 



Hence 



^, = + 0.0615 = + 3 3i'-5 



BI = 0.0084 = o 28.8 



C", = 0.0166= o 57.2 



D l = + 0.0236 = + i 21. i 



., = + 0.0006 = + o 1.9 



