1838.] 



Memoir on the Indian Surveys, 



439 



Mr. Ramsden, which professed to have been laid off at the temperature 

 of 50^ Fahrenheit from that artist's bar. 



Lieutenant Larabton's first operations after this, were to carry on a 

 series of triangles depending on the Madras base westward, to meet 

 the Bangalore base, and finally the west coast near Mangalore. In 

 pursuance of this intention, he established the meridians of Carangoo- 

 ly, Kylasgurh, Terrakondaii, Severndroog, Mullapannabetla, and Bal- 

 royndroog, the positions of each of which he determined with relation 

 to the Madras observatory. He also essayed to measure two perpen- 

 dicular arcs, viz., those connecting Severn(h'oog with Yerracondah on 

 the east, and Mallapannabetta on the west side, each being nearly 

 sixty-seven miles in length. 



No country or circumstances could have been more favourable for 

 such an attempt, whether we regard the skill, intelligence, and zeal of 

 the operator, the excellence of his instruments, the liberality and 

 freedom from restraint which he experienced on the part of the go- 

 vernment, or the fortunate situation of the eminences on which his 

 stations were chosen. But it was his opinion that he had failed en- 

 tirely in deriving any results to be depended on fi*om his perpendicu- 

 lar arcs ; and it is now, I believe, the general opinion among mathe- 

 maticians that longitudes cannot be determined by this method, but 

 must be deduced from other sources. 



About the same period Lieutenant Lambton carried a series to the 

 southward, which terminated at a place called Trivandapooram, near 

 Cuddalore. Here he determined the latitude by a sufficient number 

 of zenith distances, and he then proceeded to Pauedre, a place nearly 

 under the same meridian, where, by another set of zenith distances, 

 he found the amplitude of the celestial arcs between the north and 

 south points of a small meridional series, in middle latitude 12° 32' 

 21". This arc forming na part of the principal meridional series, 

 which passes through Dodagoontah, was subsequently carried by him 

 to the southward down to Punnae, near Cape Comorin, and finally to 

 the northward as far as the parallel of 21 ° nearly ; but as the particu- 

 lars of these operations are all in the possession of the Court of 

 Directors, it would be superfluous to enter into any description of 

 them in this Memoir. The meridians of Severndroog and Dodagoontah 

 are so near to each other, that the same series connects both : for 

 geographical purposes, such as the determination of latitudes and 

 longitudes, the former is used, the latter only being reserved for 

 scientific details. 



