( M5 > 
u Forces are proportional to their Peripheries, or to the* 
« Semi-diameters of thefe Peripheries as is determin’d 
“ by MonC Hugens , in his The&remata de Vi Centr'b 
« fuga & Motu circulars ; but the Periphery which 
« a body in the ./Equator dcfcribes, has its Semi-diame* 
“ ter equal to the Radius or Semi-diameter of the Earth, 
« and in any other Place, the Parallels, in which Bodies 
“ move, have the Co-fines of their Latitude for their 
w Semi-diameters, and therefore it will follow, that the 
« Force of Gravity is to the Centrifugal Force in a Pro- 
Ci portion, compounded of the Radius to the Co-fine ot 
« the Latitude, and of 189 to 1. and therefore at the 
« Latitude of 51° 46/ (for Example) it will be as 
u 4 66 to %, 
“ But we mufl obferve, that it does not from thence 
« follow, that a Body in that Latitude iofes Part of 
“ its abfolute Gravity, which it wou’d have, were the 
« Earth at refL For that cou’d not be, unlefs the Cen- 
« trifugal Force aded diredly contrary to the Force of 
m Gravity, which it doth no where but at the Equator; 
« for let the Circle * Q„ P E reprefent the Earth, Q.E 
« the Diameter of the ./Equator, O its Center, and let 
u B reprefent a Body which we fuppofe to hang by the 
« Thread A B, and to be placed any where between the 
“ Pole P and the .Equator d, and let B D be drawn per- 
« pendiculvrtothe Axis. It is plain, that if the Earth had 
“ had no Diurnal Rotation, the Body B wou’d draw the 
« Thread A B into the Pofitioa of A C, fince by that 
« means it defcends as near as it can to the Center, and : 
“ there it wou’d ftretch the Thread with all the Force 
“ of its Gravity } or if we will fuppofe, that the Centri- 
« fugal Force aded according to the fame Diredion A C, 
« it wou’d then dirediy oppofe the Force of Gravity, 
* 
Fi£*V. 
and 
<« 
