MAGNETIC DECLINATION AND HORIZONTAL FORCE. 
2 
i 
Table 20. 
Horizontal Force. 
a, 
h 
O-i 
b 2 
Ai 
Bi 
A* 
b 2 
7mW • 
-*0000020 
+-0000015 
- -0000021 
-•0000013 
/.■i(/t) . 
-‘0000050 
--0000023 
- -0000023 
--0000012 
November to January 
/c. 2 (/i) 
+ '0000006 
--0000093 
+ -ooooooi 
--0000126 
... 
... 
+-0000136 
--0000017 
+ *0000134 
+ *0000007 
r/c-iW ■ 
-•0000038 
--0000004 
+-0000018 
- '0000006 
+-0000015 
+ -0000003 
--0000014 
+-0000025 
February to April . . 
Jc.zfjl) 
+ -0000014 
-*0000036 
+-ooooon 
- -0000067 
L/-iW • 
... 
+ -0000123 
+-0000018 
+-0000071 
+ -oooooio 
Cfc-lW ■ 
--0000023 
- -0000003 
--oooooio 
+ -0000025 
+-0000028 
+ ‘0000026 
+-0000013 
+-0000028 
May to July 
fc. 2 (h) . 
-*0000021 
- *0000032 
-*0000014 
--0000021 
IMh) . 
... 
... 
+ *0000053 
+ -0000017 
+ *0000044 
+-0000007 
rfc-M . 
--0000028 
--0000017 
+-0000013 
- -0000006 
+ -0000033 
--0000017 
+ -0000008 
+ *0000008 
August to October. . 
Mh) . 
-*0000004 
--0000037 
- -0000003 
--0000033 
U-#) ■ 
... 
... 
+-0000067 
--0000013 
+-0000063 
+-oooooio 
And from these coefficients were calculated the values of -| >/(«! +Bj) 3 +— Ai) 3 ; 
2V / («2+Bo) 3 +(6 2 —Ao) 3 ; i\/(«2 —Bo) 2 +(6 3 +Ao) 3 ; and \\/{a x — B 1 ) 2 +(6 1 +A 1 ) 3 for 
each pair of typical variations f c (li),f s (li). These quantities are the coefficients A, B, C, D, 
respectively, of our transformed formula in paragraph 1 3 ; and their values are entered 
in Tables 21 and 22. 
Table 21. 
Declination. 
Ai 
Bi 
c, 
Bi 
Ao 
Bo 
Co 
D 2 
November to January . . 
February to April . . . 
May to July. 
August to October . . . 
•0000031 
•0000021 
•(J000024 
•OUOOOll 
■C000003 
•oooooio 
•0000008 
•0000015 
■0000008 
•0000004 
•0000006 
0000008 
•oooooio 
•0000013 
•0000012 
•0000009 
0000042 
•0000007 
■0000048 
■0000049 
0000099 
0000019 
•0000080 
•0000078 
0000012 
■0000006 
■0000002 
■0000014 
•0000002 
■0000019 
■0000012 
•0000008 
Table 22. 
Horizontal force. 
Ai 
B, 
C, 
Bi 
a 2 
B, 
C, 
B 2 
November to January . . 
•0000038 
•0000017 
•0000018 
•0000017 
0000114 
0000130 
■0000054 
■0000024 
February to April . . . 
•0000019 
•0000021 
•oooooio 
•0000021 
•0000031 
0000070 
0000002 
•0000043 
May to July. 
•0000015 
•ooooon 
-00000-27 
0000027 
0000042 
■00000S2 
0000015 
0000021 
August to October . . . 
•0000033 
•0000012 
•0000002 
0000009 
■0000053 
0000048 
0000016 
-0000016 
