Jordanus de Nemore
,
[Liber de ratione ponderis]
,
1565
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termine breuioris, siue in sectione dependens, uel etiam duo pon
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dera data alterum in termino, alterum insectione appensa, re
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gulam in aequedistantiam constituant, ipsa quoque in pondere
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data erit.
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Esto ut prius regula a, b, c, sitque
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a, b, ad c, b, datur in proportio
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ne appendaturque pondus d, ela
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tum aequabiliter ex parte c, duo ergo
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a, b, c, datam esse in pondere. </
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enim ipsa alicuius noti ponderis quod
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diuidatur secundum proportionem a,
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b, a, d, et c, b, ponaturque maius a, b,
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et minus e, b, et secundum hoc inue
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nietur pondus d. </
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">sicut ergo se habet pon
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dus d, prius sumptum ad posterius sum
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ptum, ita se habebit pondus a, b, c, ad
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pondus positum. </
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minus, et t, similiter maius, uel minus
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quám positum est, erit quód si, d, in e
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dependeat, et data sit c, b, ad e, b, da
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tum erit, et t, aequaliter pendens a, c,
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quód si d, et h, data sint, similiter et
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t, datum erit. quod quoniam datum
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est, datum erit pondus a, b, c.</
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tum respicit prius schema praecedentis
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propositionis.
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Quaestio decimanona.
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inaequalia diuidatur, et alter mi
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nus ipsius data pondera appen
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dantur, quae in aequalitate con
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sistant, brachia quoque librae a
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centro, examinis data erunt.
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dus d, et a, c, pondus utrunque
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et sit b, z, aequalis b, c, et diui</
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