Jordanus de Nemore
,
[Liber de ratione ponderis]
,
1565
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<
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id
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">Sit item b, grauius, quám c, et po
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nantur aequaliter, quia ergo utrobi
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que est aeque obliquus descensus pa
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tet, quia b, descendit. </
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<
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">Ponatur etiam
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b, inferius, ut libet, et, c, superius: di
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co quód etiam in hoc situ erit gra
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uius b, dimittant enim directae lineae
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c, d, et b, h, et contingentes circulum
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sint b, l, c, m, et sit arcus c, z, simi
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lis, et aequalis, et in eodem situ cum
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arcu b, e, quem et linea c, m, contin
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get. </
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">Et quia obliquitas arcuum b, e,
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uel c, z, est angulus d, c, z, et obli
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quitas arcus, c, e, est in angulo
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d, c, m, atque proportio anguli
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d, c, z, ad angulum d, c, m, est
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minor qualibet proportione,
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quae est inter maiorem, et mi
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norem quantitatem. </
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<
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">Minor et
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erit, quám pon
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deris b, ad pondus t. </
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<
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id
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">Quomodo ergo plus ad
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dat b, super c, quám obliquitas
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super obliquitantem grauius
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erit b, in hoc situ, quám c, hac
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rationem non definet b, descen
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dere, et, c, ascendere, usque f, e, q.
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<
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">Quaestio tertia.
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<
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">Omne pondus in quam
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cunque partem discedat ab
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aequalitate secundum situm
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fit leuius.
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<
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">Svpra enim locum aequalita
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tis duo loca signentur super,
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et infra, et ab omnibus arcus
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resecentur ab inferiore aequales, ut
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libet parui, et qui est sub loco ae
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qualitatis plus capiet de directo.</
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