X 
CAPTAIN ELLIOT’S MAGNETIC SURVEY OF THE INDIAN ARCHIPELAGO. 
Mean Hourly Oscillation of the Magnetic Declina- 
Singapore Astron.Mean 
Time. 
13. 
13. 
14. 
15. 
16. 
17. 
18. 
19. 
20. 
21. 
^2. 
December 
2-34 
2-34 
2-27 
2-16 
2-08 
1-72 
6-88 
000 
0-01 
0-64 
1-49 
January 
2-43 
2-35 
2-24 
2-10 
1-88 
1-53 
0-91 
0-03 
0-00 
0-62 
1-15 
February 
2-88 
2-82 
2-80 
2-82 
2-67 
2-47 
1-93 
0-78 
0-04. 
0-00 
0-52 
March 
1-25 
1-30 
1-28 
1-24 
1-18 
1-15 
1-16 
0-71 
0-00 
0-11 
0-75 
April 
1-22 
1-38 
1-44 
1-43 
1-31 
1-22 
1-66 
1-43 
0-47 
0-00 
0-28 
May 
1‘56 
1-73 
1-91 
1-96 
2-01 
2-1 1 
3-05 
3-34 
2-07 
1-00 
0-42 
June 
O'oo 
0-78 
0-86 
1-00 
1-03 
1-21 
1-96 
2-32 
1-23 
0-62 
0-00 
July 
0-77 
1-01 
1-20 
1-13 
1-15 
1-65 
2-44 
2-87 
1-89 
0-78 
0-15 
August 
1-81 
2-01 
2-09 
2-18 
2-24 
2-52 
3-66 
4-05 
2-59 
1-13 
0-23 
September 
1-67 
1-83 
1-85 
1-91 
2-01 
2-07 
2-86 
2-57 
1-12 
0-26 
0-00 
October 
2-06 
2-02 
2-02 
1-90 
1-82 
1-64 
1-68 
0-84 
0-18 
0-00 
0-42 
November 
2-06 
2-09 
2-04 
1-90 
1-68 
1-45 
0-68 
0-00 
0-02 
0-35 
1-16 
Sums 
20-60 
21-66 
22-00 
21-73 
21-06 
20-74 
22-87 
18-94 
9-62 
5-51 
6-57 
Means 
1-72 
1-81 
1-88 
1-81 
1-76 
1-78 
1-91 
1-58 
0-80 
0-46 
0-55 
Oscillation 
1*26 
1-35 
1-37 
1-35 
1-30 
1-27 
1-45 
1-12 
0-35 
0-00 
0-09 
Mean Oscillation of the Magnetic Declination at Singapore 
1843 
1-31 
1-37 
1-41 
1-32 
1-30 
1-20 
1-36 
1-02 
0-37 
0-00 
0-10 
1844 
1-36 
1-46 
1-49 
1-51 
1-46 
1-41 
1-57 
1-23 
0-38 
0-00 
0-04 
1845 
M3 
1-21 
1-24 
1-24 
1-21 
1-20 
1-41 
1-13 
0-37 
0-00 
0-14 
Sums 
3-80 
4-04 
4-14 
4-07 
3-97 
3-81 
4-34 
3-38 
1-12 
0-00 
0-28 
Oscillation 
1-27 
1-35 
1-38 
1-36 
1-32 
1-27 
1-45 
1-13 
0-37 
0-00 
0-09 
