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Cc ./Equator of a flatted Spheroid of the fame Solidity ? 
c ‘ allowing that then it wou’d be greater in the Sphere* 
tc and ftill greater in the flatted Spheroid: but only the 
<c Centrifugal Forces in feveral Latitudes upon the fame 
V. Figure.” But I beg Leave to differ from him for the 
following Reafons. 
Fir ft) Becaufe the Force of Gravity is not the fame 
at the /Equator of the flatted Spheroid, as it is at the 
/Equator of the Sphere, or as it is at the ^Equator of 
the oblong Spheroid. 
Secondly , Becaufe it is not the fame in different La* 
titudes, in either of the Spheroids. (See Sir IJitac Hew- 
ton Lib. 3. Prop. 19 and 20.) And Monf. Mairans 
Way of arguing will only ferve, in Cafe the Gravity 
fhou’d be the fame in all the Points of the Surface of the 
Earth in his Figure, and alfo in the two other Figures. 
For Example, jet the uniform Gravity be call’d g } and 
Fir ft, let the Centrifugal Force at the /Equator of the 
flatted Spheroid be call’d c + 2 ; and the Centrifu- 
gal Force in any Latitude, as for Example, the Lati- 
tude of Taris (as it is diminifhed on Account of a fhqr- 
ter Co-fine of Latitude, and likewife on Account of its 
Obliquity to the Line of Tendency,) be call’d r*f 2-/; 
the Difference of the Diminution of Gr avity at Taris 
and at the /Equator will be £ — c + 2 ^ — C g — c+2 — / 
= /. 
Secondly , Let the Centrifugal Force at the /Equator 
of the Sphere be call’d c + 1, and the Centrifugal 
Force at the Latitude of Taris be call’d r -f- 1 — 
l + m ; the Difference of the Diminution of Gravity at 
T t 2 Taris , 
