ag4 Mr. laxdek’s new ’Theory of 
denoted by s and t reflectively. Then, confidering the 
' body as urged to turn about that diameter of its equator 
which is at right angles to ab, the accelerative force of 
s every particle in the laid ordinate will be = + * x f, 
, and the motive force of all the particles in the fame ordinate 
will be 
v/ s + ** . x 1 + . 
xf is= 
s' g 
f s Vyw 1 ', to which (by 
i ** 9 I 
the property of the lever) a motive force =— — x f j vy 2 -s l 
acting at the diftance g from the center at right angles to 
a ray therefrom would be equivalent. Therefore, confi- 
dering x and y as invariable, and s only as variable, 
/ 
x the whole fluent of x s z +x z will denote a 
g y 
force which, acting at the diftance g from c, would be 
equivalent to; the motive force of all the particles in the 
fedtion hi whofe radius is hi and thicknefs x. Which 
fluentis xh z -x z xx z + ~xh z -x\ Con- 
8 A r z F 
fequently ~gj~ x the whole fluent of x x b z — x l x 
x l + Tb l * b z -x z will denote a, motive force which, adting 
at the diftance g from c at right angles to a ray therefrom, 
<would be equivalent to the whole motive force urging 
-the fpheroid to turn as above mentioned. Such equivalent 
force 
