viii CAPTAIN ELLIOT’S MAGNETIC SURVEY OF THE INDIAN ARCHIPELAGO. 
Oscillation of the Declination at Singapore, 
Astron. Mean Time. 
12. 
13. 
14. 
15. 
16. 
17. 
18. 
19. 
20. 
21. 
22. 
November 1848... 
/ 
2-61 
2-29 
1-82 
1-05 
6-22 
6-00 
6-92 
2-25 
Oeeemlier 
2-72 
2-50 
2-25 
1-29 
0-00 
0-04 
1-28 
2-50 
Mean 
2-66 
2-39 
2-03 
M7 
0-11 
0-02 
MO 
2-37 
Oscillation 
2-64 
2-37 
2-01 
M5 
0*09 
0-00 
1-08 
2-35 
Mean Hourly Oscillation of the Magnetic Declination at Singapore 
December 
2-34 
2-34 
2-27 
2-16 
2-08 
1 72 
0-88 
0-00 
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 
M5 
February 
2*88 
2-82 
2-80 
2-82 
2-67 
2-47 
1-93 
0-78 
0-04 
0-00 
0-52 
Sums 
7-65 
7-51 
7-31 
7-08 
6-63 
5*72 
3-72 
0-81 
0-05 
1-26 
3-16 
Means 
2-55 
2-50 
2-44 
2-36 
2-21 
1-91 
1-24 
0-27 
0-02 
0-42 
1-05 
Oscillation 
2-53 
2-48 
2-42 
2-34 
2-19 
1-89 
1-22 
0-25 
0-00 
0-40 
1-03 
Mean Hourly Oscillation of the Magnetic Declina- 
March 
1-25 
1-30 
1-28 
1-24 
M8 
M5 
M6 
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 
207 
1-00 
0-42 
Sums 
4-03 
4-41 
4-63 
4-63 
4-50 
4-58 
5-87 
5-48 
2-54 
Ml 
1*45 
Means 
1-34 
1-47 
1-54 
1-54 
1-50 
1-53 
1-96 
1-83 
0-85 
0-37 
0-48 
Oscillation 
0-97 
MO 
M7 
M7 
M3 
M6 
1-59 
1-46 
0-48 
0-00 
0-11 
Mean Hourly Oscillation of the Magnetic Declina- 
June 
0-55 
0-78 
0-86 
1-00 
1*03 
1-21 
1-96 
2-32 
1-23 
0-62 
0-00 
July 
0-77 
l-Ol 
1-20 
M3 
M5 
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 
M3 
0-23 
Sums 
3-13 
3-80 
4-15 
4*31 
4-42 
5*38 
8-06 
9-24 
.5-71 
2-53 
0-38 
Means 
1-04 
1-27 
1-38 
1-44 
1-47 
1-79 
2-69 
3-08 
1-90 
0-84 
0-13 
Oscillation 
0-97 
1*20 
1-31 
1-37 
1*40 
1*72 
2-62 
3-01 
1'83 
0-77 
0 06 
Mean Hourly Oscillation of the Magnetic Declina- 
September 
1-67 
1-83 
1-85 
1-91 
2-01 
2-07 
2-86 
2-57 
M2 
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 
M6 
Sums 
5-79 
5-94 
5-91 
5-71 
5-51 
5-16 
5*22 
3-41 
1-32 
0-61 
1-58 
Means 
1-93 
1-98 
1-97 
1*90 
1-84 
1-72 
1-74 
M4 
0-44 
0-20 
0-53 
Oscillation 
1*73 
1-78 
1*77 
1-70 
1-64 
1-52 
1-54 
0-94 
0-24 
0-00 
0-33 
Mean Hourly Oscillation of the Magnetic Decli- 
Winter 
2-53 
2-48 
2'42 
2-34 
2-19 
1-89 
1-22 
0-25 
0-00 
0-40 
1-03 
Spring 
0-97 
MO 
M7 
M7 
M3 
M6 
1-59 
1-46 
0-48 
0-00 
0-11 
Summer 
0-97 
1-20 
1-31 
1-37 
1-40 
1-72 
2-62 
3-01 
1*83 
0-77 
0-06 
Autumn 
1-73 
1-78 
1-77 
1*70 
1-64 
1-52 
1-54 
0-94 
0-24 
0-00 
0-33 
Sums 
. 6-20 
6-56 
6-67 
6-58 
6-36 
6-29 
6-97 
5'66 
2-55 
1T7 
1-53 
Means 
. 1-55 
1-64 
1-67 
1-64 
1-59 
1-57 
1-74 
1-41 
0-64 
0-29 
0-38 , 
Oscillation 
. 1-26 
1-35 
1-38 
1-35 
1-30 
1-28 
1-45 
M2 
0-35 
0-00 
0-09 
