Monantheuil, Henri de, Aristotelis Mechanica, 1599

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Sed & ſi perficiantur parallelogramma d s t f & d y r g:
illud erit vtile ad oſtendendum d tralatum vno motu vſque ad s,
altero motu, quo retrahitur ad centrum, reductum eſſe ad t: &
huius retractiones menſuram eſſe s t vel d f: hoc vero vtile etiam erit
ad terminandos motus illos duos naturalem, ſcilicet & præter naturam.
Atque alterolongum.] Hoc quadrilaterum oblongum, & rectan­
gulum compleri debuiſſe dici poteſt, vt rectus in eo motus appareat,
quem facturus radius fuiſſet, niſi retraheretur in centrum: tum vt
terminet motus eos, qui ſunt ſecundum naturam & præter naturam.
a q h] Punctum q vbi libet in peripheria accipitur ad deſignandum
quoduis ſpatium, quod confecerit x extremum mobile minoris radij a x.
Et a q excitetur.] A puncto q extra lineam a x dato ex­
citatur in ipſam perpendicularis, quæ eſt q z prop. 12. lib. 1. elem.
Et rurſus per q] Per punctum q datum datæ rectæ a b duci­
tur parallela prop. 31. lib. 1. elem.
Et w n perpend.] prop. 12. lib. 1. elem.
Sunt vero w n &] Quia q w parallela eſt ipſi z n ex fabrica:
tùm w n etiam parallela eſt ipſi q z, quia in eas incidens z n facit an­
gulos internos ad eaſdem partes rectos, ex fab. proinde æquales ax. 10.
itaque parallelæ prop. 28. lib. 1.
parallelogramum erit w n z q. per def. pa­
rall.
quare eius latera oppoſita w n & q z erunt æqualia prop. 34. lib. 1.
In circulis.] Ex hoc loco elicitur hoc theorema. Perpendicula­
res à peripheriis in ſemidiametros circulorum inæqualium æquales
ſegmenta auferunt de ſemidiametris inæqualia, & quidem maius in
minori comprehenſum inter peripheriam & perpendicularem.
Expo­
15[Figure 15]
ſitio.
Sunto
duo cir
culi in­
æqua­
les A
B C ma
ior &
D E F
minor, perpendiculares ſint B K, E I & ablatæ A K, D I.

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