Varro, Michael, De motv tractatvs

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1 4[Figure 4]
Docuimus quis ſit ſimplicis ve­
ctis effectus, ſimplex autem ve­
ctis ſemicirculi conuerſione ſuam
operationem abſouit, ita vt ſi
vlteriùs F moueatur in in alio ſe­
micirculo motus prioribus contra­
rios cieat: vt exempli gratia, ſit
vectis AB, cuius hypomochium
ſit C, dum A punctum deſcribet ſemicirculum AFD,
motus ille deorſum erit: interea verò B punctum
deſcribet ſemicirculum BGE aſcendendo: ſi verò A
tranſcendat, D incipiet aſcendere: B verò tranſcen­
dens, E deſcendet: ideo excogitata eſt vectis ratio per­
petua ex plurium vectium ſucceſſione circa idem
hypomochlium: eſt autem illa tum in ergatis aut ſu­
culis, tum in duorum tympanorum homocentrico­
rum, ſeu eadem axe transfixorum in planis parallelis
aptatione, quorum ſemidiametri ſint in eadem pro­
portione quæ in vecte ad propoſitum motum cien­
dum neceſſaria eſt: centrum verò eorum ſeu axis fi­
xa ſit, ac ita vires aptentur, vt maior minorem, mi­
nor verò maiorem tympanum impellat.
Quemad­
modum autem horum tympanorum homocentri­
corum opera vectis perpetui ratio inuenta eſt, ita eo­
rum multiplicatione motus, & mouentis & mouen­
di
, proportio in infinitum augeri poteſt.
Cuius rei

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