[ 33 ] 
The meafure of a fecond- pendulum, at the equa- 
tor, I had from M. de la Condamine, as wa 9 faid 
before : it was corrected for the centrifugal force, 
and the refinance of the air ; and the moon’s di- 
ftance, as revolving round the earth at red, was cor- 
rected for the fun’s difturbing force : which is done 
either by diminilhing that diftance in the fubtriplicate 
ratio of 178725 to 177725 ; or by diminifhing 
the length of the pendulum in the limple ratio of 
thefe numbers. In this laft correction I was favoured 
with the advice and abidance of the Rev. Mr. Price, 
and of the Aftronomer Royal, FF. R. S. 
a correction of M. Picart’s operations, found to be only 57075 
toifes ; the diameter of the equator here ufed ought to be di- 
saniniihed by about 18 10000th parts. 
vol. Lvnr. 
F 
Received 
