Guevara, Giovanni di, In Aristotelis mechanicas commentarii, 1627

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130[Figure 30]
ratio ac de libra, cuius iugum ſit AB, lances verò C, D,
& axis, ſeu fulcimentum E.
Siquidem ipſum D pendens
ex longiori brachio libræ, præponderat ipſi C.
Quemad­
modum potentia applicata in vecte vbi D, ſuperat graui­
tatem ponderis C.
Axis verò cum ponatur infra iugum, ſiue
ipſum iugum ſit ſuſpenſum per trutinam, aut ſpartum, ſiue
innixum ſit alteri corpori immobili, idem ſemper præſtat,
ac fulcimentum vectis vbi E.
Quoniam autem (proſequitur Ariſtoteles) ab æquali
pondere celerius, ſiue facilius mouetur brachium libræ,
quod magis à centro diſceſſerit, vt explicatum eſt de libra,
quæ alterum brachium longius obtinet, eam ad circulum
reducendo: hinc fit, vt cum duo ſint, quæ in ambis extre­
mitatibus vectis præsunt, vel ponderant, nempe mouens
in vna, & motum in alia; illud magis præponderet, quod
longiorem vectis extremitatem præſſerit; ſeu quanto magis
à fulcimento diſceſſerit, quamuis aliàs ipſa ponderantia in
ſe ſint æqualia, hoc eſt virtus mouentis æqualis ſit moto
ponderi, & longior pars vectis æquè grauitet, ac breuior.
Quod totum, vt ipſemet Ariſtoteles inquit, deſumitur ab

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