82 Differences of Meridian at Madras, [No. 97- 



which their new positions cannot be connected, except by astro- 

 nomical means. This was particularly the case, when the 

 revenue surveyors in the North-western provinces were suddenly 

 ordered to join the armies on the eastern frontiers, in the 

 Burmese war. I was at that time the Revenue Surveyor-Gene- 

 ral. With those officers, though they were withdrawn from my 

 superintendence, I continued to keep private correspondence, 

 and I particularly requested them to make as many observations 

 of the satellites as they could, that I might compare them 

 with those I made at Futtehghur ; and to the skill and zeal of 

 Majors Bedford and Wilcox, in Assam, to Major Pemberton, in 

 Munnipour, of Major Fisher, in Sylhet, Capt. Wroughton in 

 Arracan, and the late Capt. Grant, at Prome, (all officers of the 

 Bengal Native Infantry Regiments,) I am indebted for many 

 data^ by which the geography of the eastern frontiers has been so 

 much improved. It may serve to give an idea of the extended 

 field of their operations, merely to mention that the observed 

 difference of longitude taken by me at Futtehghur, and Major 

 Wilcox at Suddia in Assam, by the 1st satellite, was in time, 

 lh. 4m. 15s., or 964 miles of longitude. 



When places like Suddia, Munnipour, and others at such great 

 distances, and to which there had been no opportunity of 

 extending geodesic surveys, can have their positions assigned 

 to them exactly in latitude, and within perhaps two to three miles, 

 or indeed I think within less, by a few correspondent observa- 

 tions of the satellites, they serve as starting points, from which 

 to originate more detailed and local surveys, in those new 

 countries. As an example, 



I will now give the differences of meridian of Futtehghur and 

 Madras Observatory. My house at Futtehghur was on the high 

 right bank of the Ganges, and nearly in the rear of the left of 

 the Native Infantry lines, and in latitude 27° 21' 37". 



