1Quamobrem manifeſtum, quod inde mutatum eſt.
Quaprop
ter (vt dictum eſt prius) non eſt inconueniens, ipſum miraculo
rum omnium eſſe principium.
Ea igitur, quæ circa libram fiunt, ad circulum referuntur:
“quæ vero circa vectem, ad ipſam libram; alia autem ferè om-
nia, quæ circa Menbanicas ſunt motiones, ad vectem.
Prae
tereà etiam quoniam vnica exiſtente, quæ ex centro eſt linea,
nullum aliud alij, quæ in illa ſunt, punctorum æqua velocitate
feratur; ſed citius ſemper, quod à manente termino eſt remo
tius, pleraque miraculorum accidunt in circuli motionibus: de
quibus in ijs, quæ poſthac adducentur, quæſtionibus erit ma
nifeſtam.”
Verba re
ſecanda.
Quoniam autem secundum contrarias ſimul motiones mo
uetur circulus; & alienum quidem diametri extremum, vbi A,
in ante mouetur, alterum verò vbi B, ad retro; efficiunt non
nulli, vt ab vnica motione multi contrario ſimul moueantur
circuli; quemadmodum ſunt illi, quos in locis proponunt ſacris,
æneos, & ferreos fabricantes orbiculos.
Si enim AB, circu
lum alier contingerit, circulus in quo CD, mota circuli, in quo
AB, diametro in ante, mouebitur CD, ad retro diametro cir
culi, vbi eſt A, circà idem mota, In contrarium igitur moue
bitur circulus vbi CD, ad illum, vbi AB, El rurſus ipſe con
tiguum vbi EF, in contrarium ſibi ipſi mouebitur propter ean
dem cauſam.
Eodem etiam modo ſi plures fuerint, idem
facient, vno ſolo commoto.
Hanc lgitur in circulo exiſtentem
animaduertens naturam Architecti, inſtrumentum fabricant,
celantes principium, vt machinæ ſolum manifeſtum ſit illud,
quod admirationem præſtat, cauſa verò lateat.
COMMENTARIVS.
Tertio illud quoque admiratione dignum ſeſe offert in
circulo, quod, inquit Ariſtoteles, contrarijs ſimul fe
ratur motionibus, antrorſum videlicet, ac retrorſum,
ſurſum, ac deorſum.
Dum enim pars circuli ſuperior deſcen
dit, ac mouetur antrorſum, v. g. ad dexteram, altera pars illi
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