316 CAPTAIN ELLIOT’S MAGNETIC SURVEY OF THE INDIAN ARCHIPELAGO. 
when it appeared that for A 1, poles direct and poles reversed were nearly the same ; 
for A I L, the correction to be applied to poles direct was — 16''3, and for A 2 L, the 
correction to be applied was— 2'‘0; and these have been the corrections made use 
of at page cxxxv for Dip Circle No. 1 at Singapore. 
Inclination or Dip at Sea. 
The observations at sea were made with a Fox’s Dip Circle ; the separate observa- 
tions are not given, as they would occupy too much space ; but the mean results are 
contained in a General Table at page cxxxvii, where the observations at sea have been 
corrected for the direction of the ship’s head, for index correction (the poles being 
unchanged), and corrected with the whole of the dip observations to a mean epoch, 
viz. January 1, 1848. The details of swinging the ship, of finding the index correc- 
tion, are not included in this report, but one example is given of swinging the 
Schooner at Keemah. 
Correction for Direction of Ship's Head. 
There were in all thirteen observations: from north to east, three; east to south, 
three; south to west, three; and west to north, four. 
North to East 
East to South 
South to West 
West to North 
On shore, at Keemah, the mean of five observations by Fox’s Dip Circle was 
11° 28' 0, and as the Schooner bore E.S.E. the correction for distance would be — 1'; 
the dip by this instrument at the ship would be —11° 29', and the correction, there- 
fore, for the direction of the ship’s head and of local attraction, is, from north to east 
-l-8'*2; east to south +4'’6; south to west +4''7; west to north -|-6'‘5. 
Ship’s Head. 
Dip. Mean Dip. 
rN. . . 
N.E. . 
.E.N.E. 
pE. by S. 
E.S.E. 
-S.S.E. 
S. by W. 
s.w. . 
.W. by S. 
^W. by N. 
W.N.W. 
N.W. . 
N. bv W. 
11 37 - 5 ') 
11 3.5-0 | ll 3^2 
11 39-lJ 
11 33-7'| 
11 40-8 |lJ 33-6 
1 1 26-2J 
11 29-7'j 
1-3 11 
11 33 
■J 
33-7 
11 36 
] 1 31-1 
11 34-5 
11 39-5 
11 36-8 
11 35-5 
