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tion so. And whereas the grcat WhceI in ordinary Moventem, is placed asnear the edge os the Framing Piate //, as it may be; here it muli (withits Axis or Arbre M) poffels the Center os the Mcvemcnt because thisWhceI is to carry the Wcight or Power P, by the Vcelis M P, and thatWeight P, mu st always keep an Equidistance srom the Center os the Movc-. tnent ; that while the Body thereof (/'. e. os the Movcmcnt) persorms its Re-volutions ; the seid Weight P, and the great Wheel, (to which it is affixt,)may,without any confiderable Variation, continue in, or near the fame Position,wherein they now are. Now soppose this Weight P, with its Vcchs MP,to be taken quite out os the Movcmcnt, and the Body os the Movcmcnt to beplaced on a Horizontal Plain H H, its point os Contact in that Plain is T;v/here it should, but cannot, Rest ; be caule the Weight os that part os theTrain, mavked with the Numbers, a., 3, 4, Removes the Center os Gravitysrom M, and theresore on the opposite part os the Movcmcnt , as about C Q,the Inside os the Hoop, which tonus the Cale, is to be loaded with a thinLining os Lead, which may be a Counterpoise to that part os the Train •that 16 , the whole Body os the Movcmcnt, together with ali its Furnirure,within and without, (excepting only P, with its VeBis) may on that Hori-zontal Plain, or while it Rides upon its own Axü, Rest indifferently in anvPoint. This reducing os the Movcmcnt to an Equilibration os all its Partsin the Center M, must be perform’d Jentando, i. c. by Ralping the Lead atC GL, as much and in soch Places as is needsul ; which to an Artificer, osOrdinary Sagacity, will not be at ali difficult.

The Center os Gravity being thus reduced to M, replace the Weight P,’7 0, ^ t he Hole H, on the Arbor os the Central-Wheel M. Then let the Bodyos the Movcmcnt be placed on the Declivity D E, and sopposing P -+•L Q_D — LDE, then the Body must needs Rest there : but because theF3. 1 63 . Weight P, is not now fixt to any part os the Quadrant Q_D, but hangsupon the Train os Wheel-work 1, z, z, 4, it evidently follows, That isthe Power thereof be Supcriour to the Resistance os the Train, then thewhole Body os the Movcmcnt must needs Delcend, towards E. By this yousce there are two Offices aifigned to the Weight or Power P. The First is,to be a Counterpoile to the excess os the Weight os LED, above LQJD.The Sccond is, that it be os Force sufficient to put the Train into a Motionso Adjusted, as may exactly comport with the Time aifigned for the Revolu-, tion os the whole Body. So that is there be any ditficulty remaining, itconsists in luch an exact Stating os the Weight and Power os P, that it mayAdequately serve both these Intentions. Now how very easie this is, will bemanifest srom these Propositions following.

1. That whatever the Intrinsick Weight os P {hall be, (as soppose it 4Ounces Troy ;) yet the Power os that Weight will be Augmented or Dimi-nilhcd according to the different Degrces os its Elevation in the QuadrantT Q, Thus considering P M, as a Vcttis, its Hypcmocblium is M, the Pointwhere it exerts its Power on the Train, is at V j I (ay then, whatever Powerit has upon the Point V, in its present Elevation os 45" Dcg. it will acquirea greater by being raiscd to 50. yy. QV. and the grcatest es all in 90 Dcg.

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