IV. 



An Account of the Trigonometrical Operations 

 in crossing the Peninsula o/" India, ayid connecting 

 Fort St. George with Mangalore. 



BY CAPT. WILLIAM LAMBTON. 



Communicated hi/TnE Honorable William Petrie, 

 E$Q. Governor of Yokt St. George. 



ceneral account. 



IN the year 1801 I had the honor of communicat- 

 ing to the Asiatic Society my intention of extending 

 a geographical surve}^ across the peninsula of India^ 

 with a view to ascertain certain positions on the Coro- 

 mande I and Malabar coasts, and to fix the latitudes 

 and longitudes of all the principal places, in the in- 

 terior country, within the extent of the operations 

 for connecting the two seas. My labours commenced 

 in the Carnatic, in 1803, in measuring a small arc on 

 the meridian and on its perpendicular, an account of 

 which has been published in the 8th Vol. of the 

 Asiatic Researches. The triangles, from which those 

 arcs were deduced, constitute a part of the general 

 survey under my superintendance, now extended from 

 sea to sea, taking in upwards of two degrees of lati- 

 tude. A series of principal triangles has also been 

 carried down in a meridional direction, from which 

 has been deduced an arc of three degrees and upwards 

 in amplitude, giving the length of the degree, on the 

 meridian, in lat. 1 1° 59' 55" j equal 60494 fathoms, 

 and that from a great number of observations of dif- 

 ferent fixed stars. As I expect that the detailed par- 



