596 



qualifying circumstances of the separate observations were known to 

 them, and that any attempt to depart from their conclusions at the 

 present time would probably lead to error. 



The Committee remark that the exhibition (in the Asiatic Ke- 

 searches) of the adopted angles with the corrections required to make 

 the sum of the angles in each triangle equal to two right angles, 

 renders it impossible that any clerical or typographical error can 

 escape discovery : if any such should be found, of which the proper 

 correction is not obvious and certain, they think it proper that re- 

 ference should be made to the manuscripts now preserved in the 

 Archives of the Department of State for India ; but they recommend 

 nothing further. 



3. In regard to the accuracy of the calculations of the sides of 

 the triangles, founded on the adopted angles to which allusion is 

 made above, there appears to be no check except the verifications by 

 the measure of widely-separated bases ; and the comparison of these, 

 as presented in the Asiatic Researches, shows a degree of accordance 

 which the Committee, guided by the results of Sir George Everest's 

 experience, consider satisfactory. Still they remark that the form 

 in which these calculations are printed makes their verification ex- 

 tremely easy, and the Committee recommend that they be verified. 

 Of the next step of calculation, namely the computation and aggre- 

 gation of successive portions of the meridian (including the astrono- 

 mical determinations of azimuth), there appears to be no check what- 

 ever j and the Committee recommend that this important calculation 

 be repeated, and in a different form, if the officer entrusted with such 

 revision should think it desirable. 



4. The details of the base-measure reductions, as founded on 

 Colonel Lambton's statements of the measuring process, admit of 

 easy verification ; and the Committee recommend that they be veri- 

 fied. But the evaluation of all these measures, for application to the 

 estimate of the length of Arc of Meridian at the level of the sea, re- 

 quires that the elevation of the bases be very approximately known. 

 The portions of the Arc surveyed respectively by Colonel Lambton 

 and Sir George Everest, join each other at Damargida; and there 

 is a large discordance between the elevation of this station, as given 

 first by Colonel Lambton, and secondly by Sir George Everest and 

 Sir A. "Waugh. Guided by the information which Sir George Everest 



