DelMonte, Guidubaldo - Mechanicorvm Liber

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63numeris data proportio inter potentiam, & pon
dus inueniri poſsit; dicamus.

LEMMA.

Sint rectæ lineæ AB CD parallelæ, quæ in
punctis AC circulum ACE contingant, cuius
centrum F: & FA FC connectantur. Dico
AFC rectam lineam eſſe.

Ducatur FE ipſis AB CD æquidiſtans.
& quoniam AB, & FE ſunt parallelæ, &
angulus BAF eſt rectus; erit & AFE re
ctus. eodemq; modo CFE rectus erit. li
nea igitur AFC recta eſt. quod erat de
monſtrandum.

134[Figure 134]

18 Tertii.29 Primi.14 Primi.

PROPOSITIO I.

Si funis trochleæ ſupernè appenſæ orbiculo
circunducatur, alterumq; eius extremum pon
deri alligetur, altero interim à potentia pondus
ſuſtinente apprehenſo: erit potentia ponderi
æqualis.

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