Lieut. Col. Lambton ’s abstract } &c. 487 
of the Asiatick Researches. But as it may be three or four 
years before that volume makes its appearance, I have been 
induced to draw out this abstract of the results, thinking that 
the conclusions herein contained may be interesting to the 
Royal Society, and to the astronomers of Europe. As a re- 
ference may be made to the volumes above mentioned, I have 
simply given the lengths of the sides of the triangles from 
which the arcs are deduced, together with the lengths of the 
terrestrial and celestial arcs, without including either the 
tables of triangles, or the particulars of the astronomical 
observations, farther than the names of the stars, and the 
mean lengths of the celestial arcs, and, consequently, the mean 
degrees deduced therefrom. 
The first of these sections gives the degree due to latitude 
9° 34/44 ,# > the middle point of that arc, equal 60472,85 
fathoms. The second section, whose middle point is in latitude 
13 0 2' 55", gives the mean degree equal 60487,56 fathoms. 
The last section gives the degree equal 60512,78 fathoms, 
due to the latitude of i 6°34'42", the middle point of that 
section. 
In my second paper, in the 12th vol. of the Asiatick 
Researches, it appeared that the degree due to latitude ii° 
37' 49 ”» the middle point between Punnas and Namthabad, 
was 60480,3 fathoms. Since that paper was sent, there has 
been a small correction applied to the base near Gooty, after 
comparing the chains with the brass standard scale. This 
correction has somewhat increased the meridional distance 
between that base and Yerracondah south; and, consequently, 
the whole terrestrial arc between Namthabad and Punnas is 
also increased, which now gives the degree due to latitude 
