Chap. 9 



a certain time. Which being To, we may in the next place 

 c -nfidcr thtc this d&& of moving A may bediminifced 2 waie*, 

 cLherbccauft the fjMce it is to be moved in, is leflened ; or the 

 tiinetaktft up in its motion, iscncreafcd : for, as it is a greater 

 dfeft, to movfc A through thcfpace CD, in a Icflc time then 

 EF, fo it ii a Idle cffeft to move the fame A, through the 

 fpacc CD, in a greater time then EF ; or through a lefle fpacC 

 then Ctt in the time EF. Now then, this being fuppofed, 

 that it is a lefle cffed to uioVe A through CD, in a greater 

 time then EF, it followeth alfo, that a lefirr virtue is abk to 

 x iriovc it through CD in a. greater time then EF, then the virtue 



which is required to move it, through the fame fpacein the 

 time EF. Which if it be oftce granted (as it cannot be denied) 

 then multiply ing the time, as much as the virtue or force re- 

 cy.nrcd to move A through CD in tht time EF is greater 

 then the force B j in fo much time, the force B will be able to 

 move A through CD. .Which diicourfe is evident, if we take 

 it in the common terms but ifit be applied to action, wherein 

 phyfkall accidents intervene, the artificer muft have the judge- 

 ment to provide for them^according to the nature of his matter. 

 5- . Upon 'this laft difcourfe doth hang the principle which go* 

 of P M"- verhtth Mechanics, to wit, that the force and the diltance of 

 icks dcdu- weights cbuhterpoyfino; one another, oup'ht to be rtdprocall. 



ccd out of the _,->. i ii t t -i - i 



former dif- That is, that by how much the one Weight rs freavfer then tnt 

 eau:fc * other, by fo mucli mu'ft the difhncc of the lighter 'from the fixed 



point upon which they are moved, be greater then the diftanct 

 of the greater weight from the fame point: for it is plain that 

 the weight which is more diftant, muft be moved a greater 

 'fbacethcn the nearer weight in the proportion of the two di- 

 ftances. Wherefore the force moving it muft carry it in a velo- 

 city of the fai-.l proportion to the velocity of the" other. And con- 

 icqucntly, the Agent, or mover, mnft be in that proportion 

 more powerful) then the contrary mover. And out of this pra- 

 cTife of Geometricians in M'echa nicks (which is confirmed by 

 experienccjit is made evident that if other conditions be eqtiall, 

 theexccfleof fo much gravity will make fo much Velocity. And 

 . fb much v-elocity in proper tion,Wil recompence fb much gravity 



, , Out of the precedent conclnfionsjanottier followeth rwhich is> 



No mo-cablc . i , r ,1 A i 



can partc iiom thac nothing reccdcth from quiet or r'elt, and attamcth ^ great 



