Marci of Kronland, Johannes Marcus
,
De proportione motus figurarum recti linearum et circuli quadratura ex motu
,
1648
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Igitur pendulum TC ex C & E æquali tempore recurrit inſu
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am ſtationem TB. </
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Obijcies. </
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>Lapſus grauium per plures chordas eſt velocior per 4. theo
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rema. </
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>Cùm ita〈que〉 in circuli curvaturâ ſint chordæ poteſtate infinitæ;
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erit velocior lapſus per arcum, quàm per quotcun〈que〉 numero chordas.
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>Videtur hæc ratio mouiſſe Galilæum, ut in lib. de Syſtemate
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mundi motum per arcus circuli poſuerit velociorem motu per
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illorum chordas. </
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His, inquit, adde mirabile aliud, ſcilicet quòd motus cadentium facti
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per arcus quadrantis AB fiant breuioribus temporibus, quàm illi, qui
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per chordas eorundem arcuum fiunt. </
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>Et paucis interiectis, mobile, in
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quit, diſcedens à puncto A minori tempore perueniet ad B, currendo per
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duas chordas AD. DB, quàm per ſolam chordam AB. </
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>Sed breuiſsimum
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omnium tempus fuerit, ſi deciderit per arcum ADB.
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<
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>Verùm diſſoluitur hæc obiectio, quòd motus per plures chor
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das interciſus,
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huius exceſſ
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9
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determinetur per lineas, quæ
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à termino motús per unam chordam, cadunt perpendiculari
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ter ad alias, per primum theorem: & quò plures fuerint chor
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dæ eò exceſſus penultimæ erit maior. </
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>At verò in defluxu cir
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culari, quiâ nullum interuallum inter proximas tangentes, ſeu
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chordas illarum parallelas;
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ulla cadit perpendicularis. </
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<
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>Vndè ſi ex quolibet puncto refluxûs labi in cipiat per chordam,
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erit æqualis duratione reſiduo lapſui, qui cadit per chordam
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verticalem. </
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Ad Propoſitionem Vigeſimam.
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De causâ decrementi oſcillationum, & an æquales ſint
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duratione.
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<
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>Cauſa decrementi oſcillationum non eſt illa, quam attuli ad
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finem prop. 20. ſicuti enim gravitas ſe habet ad illas </
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