Guevara, Giovanni di, In Aristotelis mechanicas commentarii, 1627

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1magis detrahi à motu naturali, ac tardiùs moueri, quàm
M
B quæ magis diſtat ab illo.
Ducatur inquit à centro li­
nea
A L F; & à puncto L perpendicularis ipſi A B quæ
ſit
L Q, & rurſus ab eodem L ducatur L S paralella ei­
dem
A B.
Deinde à puncto S excitetur alia perpendicu­
laris
eidem AB. Sitque ST; & ab F item eidem perpendicu­
laris
F X.
His poſitis linea QL erit æqualis lineæ T S, vt
patet
ex 34. primi Euclidis, cum ſint latera oppoſita rectan­
guli
T L.
Cumque ſpacium, quod naturali motu tranſcur­
runt
puncta M, & B menſuretur ipſis perpendicularibus.
QL & T S, vt dictum eſt, motus naturalis per lationem ip­
ſius
B vſque ad S æqualis erit motui naturali per lationem
ipſius
M vſque ad L.
At motus præternaturales eorundem
punctorum
M, & B tunc erunt inæquales.
Nam ſpacium
quod
præternaturaliter percurriſſet punctum M eſſet ipſa
M
que & ſpatium, quod præternaturaliter percurriſſet
punctum
B eſſet ipſa B T.
Maior autem eſt M Q, quàm
ſit
B T.
Siquidem ex æqualibus rectis lineis perpendicula­
riter
cadentibus à communi diametro ad circumferentias
totidem
circulorum inæqualium, ea, quæ eſt in minori
circulo
maiorem reſecat diametri portionem, vt conſtat
ex
doctrina de Sinibus, & patere poteſt in perpendicularibus
QL
T S, & HI; quæ cum ſine æquales inter duas paralel­
las
, inæquales reſecant portiones diametri E G; nempe tan­
to
maiorem, quanto in minori circulo, vt eſt QM reſpectu
T
B, & ipſa T B reſpectu H G.
Igitur punctum M quod ſa­
propinquius eſt centro, magis mouetur motu præterna­
turali
, quàm punctum B, quod remotius eſt ab illo.
Id quod
primo
loco erat probandum.

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