as deduced from Experiments with the Pendulum. 171 



If therefore / = 39 -f &, be the length of the pendulum at 

 the latitude A, we have this general formula, viz. 



/ = 39-01339 + -2055 sin 2 *, 



•2055 i 



ellipticity = -00865 



39-01339 



= -00338 = 



2955 



Z2 



This 



