Spherical Motion . 
559 
Note referred to in pag <^519* 
(C) Without any regard to the parallelopipedon, let the form of the body be what 
it will, ifth t momenta of inertia round the three permanent axes be reprefented by 
M aa 9 Mbb, and Ucc, the relative motive forces round thofe axes will always be ex- 
preffed by 3VUV, M Py\ and M cV, ading at the diftance of radius therefrom. 
And then, in fig. 7., the centrifugal motive force adting along PI, hting — Vlb y , 
' ... ‘ py 
that aaing along BN at N will, by the laws of central force, be=M^ 2 / 
and therefore the equivalent one, a&ing at S perpendicular to SI, will been 
x —zzMby X — • —Mb ? yx urging the point S towards B. In like manner 
BN y 
it is found, that the centrifugal motive force MtfV 1 a&ing along Cl produces 
one at S perpendicular to SlzzMa^xy urging it towards C ; and the difference of 
thefe — Ma z xy — Mb 2 xy mu ft be the perturbating motive force at S, along the 
great circle BSC, as found by the other methods. And in the very fame manner 
may thofe in the other great circles bounding the c&ant be found. 
