CAPTAIN ELLIOT’S MAGNETIC SURVEY OF THE INDIAN ARCHIPELAGO. 289 
Sabine, R.A., to whose zealous superintendence and advice I am indebted, on almost 
every point connected with the reduction of the observations : I have likewise to ex- 
press my obligations to Dr. Lloyd for his advice and for many acts of kindness ; from 
their joint Report on the Magnetic Isoclinal and Isodynamic Lines in the British 
Islands, I have laid down, in a manner similar to the method there adopted, the different 
magnetic lines on the Chart of the Eastern Seas ; while to the “ Magnetical Instruc- 
tions for the use of Portable Instruments,” drawn up by Captain Riddell, R.A., I am 
indebted for the abstracts and forms in which the different instruments are registered. 
I do not therefore pretend to any originality in my plan ; and the only merit I lay 
claim to is, that these observations, taken under many difficulties, were made with 
the earnest desire to do credit to the Royal Society, who recommended the Survey, 
and to the East India Company, whose munificence enabled me to undertake it. 
The Survey consisting; first, of the observation of the differential changes of magnetic 
and meteorological phenomena at sixteen stations ; secondly, of absolute determina- 
tions of dip, intensity, and variation in Java, Sumatra, Borneo and other islands of the 
Archipelago ; thirdly, of magnetic and meteorological observations at sea, — it will 
perhaps be best to treat of each separately, and I shall therefore commence with the 
observatories. 
The following Table contains the names of the different stations at which observa- 
tories were established, commencing with the most northerly. The first column con- 
tains the stations ; the second and third, the latitudes and longitudes ; the fourth and 
fifth, the materials with which the observatories were constructed ; the sixth, the na- 
ture of the soil ; the seventh, the number of days of observation ; the eighth, the year 
and month ; and the ninth, the place of observation. 
station. 
Latitude. 
Long:itude. 
Materials with whic 
were con 
Roof. 
h the Observatories 
structed. 
WaUs. 
Nature of soil. 
No. of 
days 
obser- 
vation. 
Year and Month. 
Places of observation, j 
Moulmein ... 
16 26 49 N. 
97 45 30 E. 
Double thickness 
of canvas. 
Cotton-cloth ... 
Clay 
7 
April 1849 
Near Captain Berd- | 
more’s house. | 
Madras 
13 04 09 
80 16 30 
Cotton-cloth ... 
Cotton-cloth ... 
Clay and 
sand. 
34 
Aug. and Sept. 1849 . 
At the fixed Magnetic 1 
Observatorv. I 
Nicobar 
9 10 12 
92 48 23 
Double thickness 
of canvas. 
Cotton-cloth ... 
Coral and 
sand. 
5 
February 1849 
Near the sea-shore. I 
Sambooanga . 
6 54 20 
122 13 45 
Double thickness 
of canvas. 
Canvas 
Clay and 
sand. 
6 
May 1848 
Near the sea-shore. | 
Penang 
5 25 36 
100 24 30 
Double thickness 
of canvas. 
Folds of cotton- 
cloth. 
Clay and 
sand. 
5 
January 1849 
Near the sea-shore. 1 
Pulo Binding 
4 12 47 
100 32 52 
Double thickness 
of canvas. 
Folds of cotton- 
cloth. 
Clay 
3 
January 1849 
Near the sea-shore. 
Sarawak 
1 33 54 
110 29 00 
Thatched with 
leaves of Neepa. 
Leaves of the 
Neepa palm. 
Clay 
72 
June, July and Au- 
gust 1846. 
Near Sir J. Brooke’s 
house. 
Keemab, Ce- 
lebes. 
1 21 55 
125 07 59 
Canvas 
Canvas 
Clay 
10 
June 1848 
In the village, not far 
from the shore. 
Pulo Peesang 
1 27 53 
103 19 15 
Canvas 
Canvas 
Clay and 
sand. 
5 
January 1846 
Close to the sea- 
shore. 
Singapore ... 
1 18 32 
103 56 30 
Thatched with 
leaves of Neepa. 
Wood and sun- 
burnt bricks. 
Sand upon 
blue clay. 
30 
Nov. and Dec. 1848 . 
At the fixed Magnetic 
Observatory. 
Carimon 
0 59 22 
103 27 00 
Canvas 
Canvas 
Sand 
6 
January 1846 
Close to the sea- 
shore. 
Pulo Booaya . 
Padang, Su- 
matra. 
0 09 09 
104 21 00 
Canvas 
Sand 
4 
February 1846 
On the sea-shore. 
0 58 58 S. 
100 31 15 
Double thickness 
of canvas. 
Canvas 
Ferruginous 
sand. 
78 
Oct., Nov., Dec., 1847 
and Jan. 1848. 
Near the sea-shore. 
Batavia 
6 09 52 
106 58 00 
Thatched with 
leaves of Neepa. 
Thick bamboo 
matting. 
Clay 
199 
From Nov. 1846 to 
July 1847. 
In the midst of a vast 
plain of rice-fields. 
Cocos or Keel- 
ing Islands. 
12 05 38 
96 50 30 
Double thickness 
of canvas. 
Cocoa-nut leaves 
Fragments 
of coral. 
27 
August and Septem- 
ber 1848. 
Close to the sea- 
shore. 
2 p 
MDCCCLI. 
