REPRESENTING MEASURED ARCS OF THE MERIDIAN. 389 



tude 3° 7' 3"-79 {Mon. Corrcsp. xxvi. p. 52). I have taken the 

 mean of these as the amphtiicle, and have altered Delambre's 

 latitudes only so much as to bring them into accord with this 

 mean. The distance between the parallels of the two points is 

 found by Delambre = 1/0877 toises; by von Zach = 176874'^'. 

 The values employed by Schmidt differ considerably from the 

 above ; the amplitude being greater by 5"*205, and the distance 

 less by 9 ■^•3 3. 



2. First East Indian Arc. 



Tiivaiidepoium 

 Paudrce 



11 44 52-500 

 13 19 49-018 



1 34 5fi-428 



89813-01 



The account of this measurement is given in the Asiatic Re- 

 searches, vol. viii. p. 137. The distance is given by Larabton 

 himself = 95721"32 fathoms. But Rater's examination of the 

 standard scale on which the measurement rests, shows that a 

 correction of — O'OOOOIS must be applied, in order to ix-ducc 

 it to true English measure. The distance thus corrected is 

 = 957l9"GO fathoms, which gives the number of toises in the 

 proportion of 1-06576542 to 1. 



3. Second East Indian Arc. 



A part of this great undertaking is described in the Asiatic 

 Researches, vols, x., xii., xiii., and another part in Colonel Ever- 

 est's account of the measurement of an arc of the meridian, 

 London 1830. It has appeared to me necessary to subject the 

 observations with the zenith sector for determining the latitude 

 to a fresh calculation, which I shall publish in a separate me- 

 moir. The data as above are the results of this calculation. 

 The original observations are to be found : for Punnae, Asiat. 

 Res. xii. p. 68 ; for PutchapoUiam, xii. p. 61 ; for Dodagoontah, 

 X. p. 356 ; for Namthabad, xii. p. 339 ; for Daumeragidda, xiii. 

 p. 83 ; and for Takal K'hera and Kullianpoor, in Everest's 

 Account, &c., pp. 287 and 306. Pages 112— 111 of the latter 



