180 Mechanic Power. Book IX.

tual Rope being drawvn about all the Pulleys, vx. AD GD BEA z

for ſo the deſcent of the weight D will be four fold ſlower, andtherefore the weight ought to be four fold greater, yea, ardfomewhat more, becaufe of the much rubing of the Pulleys withthe Rope , and the reſiſtance,&c..

Fig. 126. The fifth manner is this, the Pulley B is underſſood to-be firmly affixed to the lower Wheel of the Clock , the other Aſtabliſted ſomeu here commodiouſiy, and being furniſht withſaw- like teeth with an Iron Pin to endeavour againſt the weight,as is ſaid before; from the perpetual chords of theſe Pulleyshangs the weight H in the little concentric Pulleys EFG andCDN, one of which is conjoyned immovably to the other,and both together aboue the common axis of that uh ich turns.eaſily: Moreover below let there be two Pulleys K and I. con-Joined in their centers to the common beam K L, in the middlewhereof hang the weight M. About theſe and the formerPulleys draw two perpetual chords by this artifice, the firſt Chordis BL GFE EGB, to wit, ſo that it fold ahout the Periphery, orcircuit of the whole Pulley EF G once: The other Chord inlike manner, muſt be drawn about the whole Periphery, ofthe leſſer Pulley CD N, concentric with the former, ſo that thiswhole Chord be ACN D CK A. But now that which igſaid concerning this laſt Chord, and the pulleys belonging to it,is, that it ought to be done altogether like to the other, butplaced on the other face or ſide of the Pulleys, which in likemanner contains a certain leſſer Pully equal to CDN, ſtanding.out on the other part and divides the whole office of holdingor bearing up with the other; wherefore it behoves the PulleysA and K to be alike.

That therefore the weight H be drawn with its Pulleys onwhich it bangs, you muſt apprehend the Chord A K, eitheralone or compared with another, vix. in E, and drawn down-wards; for ſo it comes to paſs that the weight E aſcends, yetin the mean while the motion of the Pulley B is not ſtopt, andconfequently neither the motion of the ClCek, or other Engin:50 lkewiſe it appears in this method, as alſo in he Precedent ,that the attraction of the weight may be continued às lopg asyou pleaſe without hindering the motion ef the Engin. Laſt-ly it appears in tliis laſt method that the motion downward ofthe Weight may be made ſſow according to any given propor-

tion,