CAPTAIN ELLIOT’S MAGNETIC SURVEY OF THE INDIAN ARCHIPELAGO. 309 
The following Table contains, by Dr. Lloyd’s method of equal intervals, the means 
of the barometer uncorrected, the barometer corrected to 32°, and the mean of the 
gaseous pressure ; each mean being the result of three sets at equidistant hours, viz. 
3,4,5 A.M. ; 11 A.M., noon, 1 p.m. ; 7j 8. and 9 p.m. The mean throughout the Archi- 
pelago, of the barometer corrected, is 29'80 to 29‘90 English inches ; the range or 
variation being a little more than a tenth of an inch. The mean of the gaseous pres- 
sure is about 29 inches ; the variation being nearly double that of the barometric 
pressure, and amounting to about two-tenths of an inch. 
Station. 
Latitude. 
Longitude. 
Mean date corresponding 
to the 
No. 
of 
days. 
No. 
of 
hours. 
Mean of 
the harom. 
uncor- 
rected. 
Mean of 
the harom. 
corrected 
to 32°. 
Mean of 
gaseous 
pressure. 
28 English inches -|- the numbers 
in the Table. 
Moulmein ... 
16 29 46 N. 
97 45 30 E. 
Middle of April 
7 
19 
in. 
1*897 
in. 
1*766 
in. 
0*913 
Madras 
13 04 09 
80 16 00 
Beginning of September 
34 
19 
1*807 
1*681 
0*806 
Nicobar 
9 10 12 
92 48 23 
Beginning of February 
5 
19 
2*052 
1*937 
1*098 
Sambooanga 
6 54 20 
122 13 45 
End of May 
6 
19 
1*997 
1*863 
1*013 
Pulo Penang 
5 25 30 
100 24 38 
End of January 
5 
19 
2*005 
1*885 
1*013 
Pulo Binding 
4 12 48 
100 32 52 
End of January 
3 
19 
2*114 
1*994 
1*156 
Sarawak 
1 33 54 
110 29 00 
Middle of June 
26 
24 
1*997 
1*864 
0*952 
Middle of July 
27 
24 
1*985 
1*854 
0*968 
Middle of August 
19 
24 
2*009 
1*879 
1*002 
Keemab 
1 21 55 
125 07 59 
End of June 
10 
19 
2*016 
1*880 
1*018 
Pulo Peesang 
1 27 53 
103 19 15 
Middle of January 
5 
18 
2*074 
1*955 
1*080 
Singapore ... 
1 18 32 
103 56 30 
End of November 
16 
19 
2*050 
1*914 
1*038 
Beginning of December 
14 
19 
2*037 
1*905 
1*053 
Padang 
0 58 58 S. 
100 31 15 
End of October 
13 
19 
2*045 
1*912 
1*097 
Middle of November ... 
26 
19 
2*040 
1*907 
1*079 
Middle of December ... 
26 
19 
2*005 
1*873 
1*053 
Beginning of January... 
13 
19 
2*017 
1*883 
1*035 
Bencoolen ... 
3 53 54 
102 28 45 
Beginning of September 
5 
19 
1*974 
1*862 
0*993 
Batavia 
6 09 32 
106 58 00 
Middle of November ... 
19 
24 
1*994 
1*860 
0*992 
Middle of December ... 
26 
24 
1*995 
1*862 
0*996 
Middle of January 
25 
24 
2*001 
1*868 
1*016 
Middle of February ... 
24 
24 
1*988 
1*856 
0*981 
Middle of March 
27 
19 
2*015 
1*876 
0*994 
Middle of April 
26 
19 
2*010 
1*873 
1*001 
Middle of May 
26 
19 
2*009 
1*873 
1*016 
Middle of June 
26 
19 
2*003 
1*868 
1*054 
Cocos 
12 05 38 
96 50 30 
Middle of September ... 
26 
19 
2*089 
1*958 
1*155 
Standard Thermometer. 
This instrument, made by Newman, was used in the observatory at Singapore till 
the end of the year 1845, and I then took it with me on the Survey. The scale is 
marked off to half-degrees, each degree being O’ 11 of an inch, so that the thermo- 
meter is read off easily to tenths. In marking off the scale, an error has been com- 
mitted in omitting one degree from 90° to 95°, so that 95° is only 94° ; the divisions 
of the scale are all equal, and therefore the mistake occurring in the numbering 
only, one degree has always been deducted from the observed reading of the thermo- 
meter when it stood at 95° or above that temperature. The standard thermometer 
