790 
AECHDEACOX PEAT! OX TliJ:. IxrLrE:NCE OF 
9. The results gathered from these Tables arc 
’North. 
Deflection at Kaliana . 
Deflection at Kalianpur 
Deflection at Damargida 
Deflection at Punnoc . 
Deflection at Near-Goa 
Deflection at Karachi . 
1- 60 D + O'76 5-f 0-80 c?, 
2T7D+1-09 5+1-68 cz, 
2- 90 D + 0-19 5+l-o5 «, 
6-22 D + 0-66 5+0-55 «, 
3- 03 D + 0-65 5+5-22 cz, 
2-11 D + 0-16 5+3-55 zz, 
East. 
_0-04D-0-46 5+0-56 cz. 
-0-08 D-1-00 5+1-48 cz. 
-0-08 D— 0-64 5+2-52 zz. 
0-19 D-6-33 5+6-36 zz. 
-0-38D-1-395+4-98ZZ. 
-0-35 D-0-28 5-0-01 zz. 
When the values of D, fz, and 5 are known, these formulce uill give the deflections. 
There have been no deep-sea soundings in the Indian or Southei-n Oceans. Ihe 
results, therefore, at which I arrive in what follows must be looked upon as demon- 
strating that the effect of the ocean on the plumb-line is of hnportance, rather than as 
determining its amount. 
10. The widths of the openings of the Arabian Sea and Bay of Bengal are as 4 to 3. 
In this ratio I shall take zz to 5. Also D I shall suppose 3 times zz, and therefore 4 
times 5. The formulce then become — 
At Kaliana. 
At Kalianpur . 
At Damargida . 
At Punnoe . . 
At Near-Goa . 
At Karachi 
deflection North 2-06 D, deflection East O'Ob D. 
deflection North 3-00 D, deflection East 0-16 D. 
deflection North 3-47 D, deflection East 0-60 D. 
deflection North 6-57 D, deflection East 0-73 D. 
deflection North 4-93 D, deflection E-ast 0-93 D. 
deflection North 3-33 D, deflection East — 0-42D. 
11. It appears from the chart of the North Atlantic in Lieut. jMaueys inteiesting 
work on the ‘ Physical Geography of the Sea,’ that between North Africa and the est 
India Islands — a width about three-fourths of that of the Indian Ocean, uheie I ha^e 
placed the depth D— many depths have been measured between 3 and 4 miles. It. 
then, we make D — 3, which will hardly be too much, the formuhie become— 
At Kaliana . 
At Kalianpur 
At Damargida 
At Punnoe . 
At Near-Goa 
At Karachi . 
H >1 
deflection North 6-18, deflection East 0-09. 
deflection North 9-00, deflection East 0-48. 
deflection North 10-44, deflection East 1-80. 
deflection North 19-71, deflection East 2-19. 
deflection North 13-83, deflection East 2-79. 
deflection North 9-99, deflection West 1-26. 
Tliese at any rate serve to shoAV that no calculations of the Figure of the Eai'th derived 
from the measurement of arcs in India can safely be depended upon, for great exactness, 
if the effect of the ocean is neglected. 
