Guevara, Giovanni di, In Aristotelis mechanicas commentarii, 1627

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1bina circa
57[Figure 57]
vtramque ex­
tremitatem
habens fora­
mina, qui­
bus toti­
dem collo­
pes, ſeu fu­
ſtes infigun­
tur, vt faci­
liùs iugum ipſum eorum beneficio cum opus fuerit conuer­
tatur, vt præ ſefert ſubſtrata figura. <
Sucula item quamuis alia poſſit ſignificare, hic tamen
machinam ſignificat tractorij generis, quæ ex tereti ligno,
aut lignorum compagine conſtat, adiuncto axe ſuffulta
æquidiſtante à plano horizontis, duobus, vel pluribus col­
lopibus pari longitudine vtrinque immobiliter adſtantibus
tanquam rotæ radijs circa modiolum, quibus admota ma­
nu, ſucula ipſa circa proprium axem obuoluitur, funeque cir­
cumducto, pondera ſubleuat, vt præ oculis hic eſt videre
in eius figura.
Quærit igitur Ari­
58[Figure 58]
ſtoteles cur ſi lon­
giores fuerint collo­
pes facilius iugum
circumagatur, quam
ſi minores, ac bre­
uiores extiterint.
Itemque cur gracilio­
res ſucculæ facilius
pariter ab eadem po­
tentia circumuoluantur, quàm craſſiores.
Vtriuſque ſubin­
de cauſam eſſe inquit, quod in vtraque machina quilibet
collops tanquam vectis ſe habet, cuius centrum, ac fulcimen­
tum eſt in medio iugi, vel ſuculæ, ſiue in intimo axe coniun­
cto, aut ſaltem in ipſis concepto: potentia verò in extremi-

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