the length of the pendulum at Madras. 167 
Also, 86172,328* : 86400 2 : : 39,232772 : 39,026280447, 
the length of the seconds pendulum at Madras by the second 
series. 
The mean of both is 39,026302 inches, being, according 
to Sir George Shuckburgh’s scale, the length of the seconds 
pendulum by these experiments at Madras in lat. 13 0 4' 9" ,1 
N. at the level of the sea, in vacuo, and at a temperature of 
70° of Fahrenheit. 
Then comparing this length with 39,142213 inches, the 
length in latitude 51° 31' 8,"4 N. as before stated, the dimi- 
nution of gravity from the pole to the equator will be ,0052894, 
and the ellipticity — — r nearly. 
r J 297,5 6 J 
J. GOLDINGHAM. 
Madras , 
May , 1821. 
