rizontal plain, or while it rides upon its own Axis^ reft in- 
differently in any poynt This reducing of the Move- 
ment to an equilibration of all its parts in the center M, muft 
be perform'd tentando^ /. e. by rafping the lead at C as 
much and in fuch places as is neecfful ; which to an Artificer 
of ordinary fagacity, will not be at all difficult. 
T HE center ofgravity being thus reducd to M, the next 
thing that follows, is the replacing of the weight P y which, 
for tlie better reprefenting itsfhape, is drawn according to 
thedinienlions of itsfolidity as Fig. and by the hole H, is 
to be feton the ^rkr of the central wheel M. Now let the 
body of the Movement be plac'd on the Dechvity D E, and 
fuppofing (as was fhow'd above fiumh, 3.) FfL QJ)z=:LD E. 
then the body muft needs reft there : but becaufe the weight 
P is not now (as in Fig. a.) fixt to any part of the Quadrant 
QJD, but hangs upon the train of wheel-worK i, -j^, g, 4. it 
evidently follows that it the power thereof be fuperior to 
the refiftance of the train, then the whole body of the 
Movement muft needs defcend^ toward! E in Ftg. 3. By this 
you fee there are z offices affign'd to the weight or power re- 
prefented by P in F^g, i, or Fig. whi h if I can make evi- 
dent it will perform, I conceive this will be a complete So- 
lution of the Frohkm. The 
1. Is, to be a counterpoife to the excefs of the weight of L 
E D, above L QJ) ; whrch that it may be, upon the reafons 
given in the explication of Ftg^ 3. 1 now crave leave to take 
for granted. The 
2. Is. that it be of force fufficient to put the train into a 
motion fo adjufted, as may exactly comport with the time 
affign'd for the revolution of the whole body So that if 
there beany difficulty remaining, itconfifts in fuchanexad: 
ftating of the weight and power of P, that it may adequate- 
ly ferve both thefe intentions Now how very eaiy this is, 
will be manifeft from thefe Propofitions following. 
I. That whatever the intrinfick weight of P mall be, (as 
fuppofe it jounces Troy ; ) yet the power of that weight 
will be augmented or diminifh'd according to the different 
degrees of its elevation in the QjadrantT Q^^Thusconfider- 
ing P M as a Ved:is, its Hyfmwiblium ({ot want of an Eng- 
liih word) is M, the point where it exerts its power on the 
train, is at V, I fay then, that v/liatever power it has upon 
the poynt V in its prefent elevation of 4/ degrees ^ it will 
acquire a greater by being raisd to f o, 5^. &c. and the 
grdateftof all in 90 degrees at and on the contrary, let 
it fink to 40 • ^ J, • its power upon the point V will ftill be 
diminifh'd.in fo much that in T it will be utterly extinguifti'd 
