Alvarus, Thomas
,
Liber de triplici motu
,
1509
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De motu locali quo ad effectum tempore difformi.
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152
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<
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xml:space
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">¶ Et confirmatur </
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<
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xml:space
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">Quia a. et b. in principio ſūt mo
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tus equales: et in toto tempore debent acquirere eq̈
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les latitudines: et in quolibet inſtanti intrinſeco eſt
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plus acquiſitum ipſi a. quã b. illius latitudinis ac-
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quirende. </
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<
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xml:space
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">igitur continuo a. motus eſt maior b. </
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<
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xml:space
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ſequentia eſt ſatis manifeſta. </
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<
s
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xml:space
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">et minor patet / q2 con
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tinuo in quolibet inſtanti intrinſeco maior pars re
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ſtat acquirenda talis latitudinis ipſi b. quã ipſi a.
<
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cum b. continuo velocius et velocius acquirat. </
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<
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">et a.
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vniformiter:
<
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xml:space
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">54. ↄ̨clu.
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cal. in c: ḋ
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mo. lo.</
note
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igitur in quolibet inſtanti intriuſeco
<
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maior pars latitudinis eſt acquiſita ipſi a. quã ip-
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ſi b. et hec eſt quinquageſima quarta concluſio cal-
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culatoris in capitulo de motu locali.</
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<
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">Tertia propoſitio </
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<
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">Omnis motus ve-
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lociꝰ et velociꝰ deꝑditꝰ quãtū ad tranſitioneꝫ ſpacii
<
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inteuſiori gradui gradu medio correſpondet hoc ē
<
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tale mobiie motum illo motu maius ſpacium in il-
<
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/>
lo tempore pertrãſit adequate quã ſi gradu medio
<
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inter extrema illius motus continuo vniformiter
<
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moueretur in illo tempore. </
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>
<
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xml:space
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">Hec propoſitio proba-
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ta eſt in ſecundo argumento prīcipali ante oppoſi
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tum in hoc capite.
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xml:space
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">.52. ↄ̨clu.
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cal. in c. ḋ
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mo. lo.</
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</
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<
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xml:space
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">Et hec eſt quinquageſima ſecun-
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da ↄ̨cluſio calculatoris in predicto capitulo de mo
<
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tu locali
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">.1. correl.</
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<
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">¶ Ex hac concluſione ſequitur / ſi a. mobi
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le moueatur in hora incipiendo ab octauo vſ ad
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quartum continuo vniformiter remittendo motum
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ſuum, et b. mobile moueatur etiam in hora ab octa
<
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uo vſ ad quartum continuo velocius et velociꝰ re
<
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mittēdo motum ſuum et a. pertranſit .6. pedalia b.
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pertranſibit pluſ̄ ſex pedalia. </
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<
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xml:space
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">Probatur / q2 mo-
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tus a. correſpondet gradui medio qui eſt ſextus. </
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<
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">vt
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patet ex prima propoſitione: motus vero b. correſ-
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pondet gradui intenſiori medio / vt patet ex tertia ꝓ
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poſitione.
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">2. correl.</
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</
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<
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">¶ Sequitur ſecundo / ſi a. incipiat mo-
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ueri ab octauo vſ ad quartum vniformiter et b. in
<
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eodem tempore moueatur incipiendo a decimo ſex
<
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to vſ ad duodecimum perdendo latitudinem .4.
<
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graduum velocius et velocius: tunc continuo b. mo-
<
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uebitur pluſ̄ in duplo velocius a. et continuo per-
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tranſibit pluſ̄ duplum ſpacium ad ſpacium in eo
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dem tempore pertranſitum ab a. </
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<
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">Probatur / q2 qñ
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a. et b. continue et vniformiter remitterentur perdē
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do .4. gradus continuo inter a. et b. ſſet maior ꝓpor
<
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tio quã dupla, īmo continuo maior et maior: qm̄ ꝑ
<
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equalem remſſionem maioris et minoris: maiorē ꝓ
<
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portionem deperdit minus quã maius / vt patet ex
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octaua ſuppoſitione quartis capitis ſecunde partis
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et quando ſunt duo numeri ſe habentes in aliqua ꝓ
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portione, et continuo equaliter remittuntur: conti-
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nuo ſe habent in maiori et maiori ꝓportione: igitur
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ſequitur / ſi ille velocitates a. et b. que ſe habent in ꝓ
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portione dupla eque velociter remittantur cõtinuo
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ſe habebunt in maiori ꝓportione quã dupla: et ſic
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b. coutinuo ſe haberet in maiori ꝓportione quã du
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pla ad ipſum a. ſed modo continuo eſt minus deꝑ-
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ditum ipſi b. quam ipſi a. cum cõtinuo reſtat ei plus
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deperdendum / vt facile patet ex caſu / igitur per locū
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a maiori continuo b. motus erit pluſ̄ in duplo ve
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locior ipſo a. motu. </
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<
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">Ex quo ſequitur alia pars cor-
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relarii / videlicet pluſ̄ duplum ſpacium pertran
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ſibit b. quam a. in eodē tempore.
<
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">3. correl.</
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<
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">¶ Sequitnr tertio /
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ſi tam. </
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<
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">quã b. remitterentur ad ſuum ſubduplum
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in hora: ita a. deperdat in hora continuo vnifor-
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miter quatuor gradus et b. octo continuo velocius
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et velocius: ſequitur / b. pluſ̄ duplum ſpacium in
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hora pertranſibit quã a. </
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<
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">Probatur / quia ſi b. motꝰ
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vniformiter remitteretur ꝑ totam illam horam ꝑ-
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dendo vniformiter .8. gradus ſicut a. perdit vnifor
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De motu locali quo ad effectum tempore difformi.
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miter quatuor: tunc motus eius correſpõderet gra
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dui medio duplo ad gradum medium motus a. / vt
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patet / q2 gradus medius inter .16. et .8. eſt .12. et gra
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dus medius inter .8. et .4. eſt vt .6: modo .12: ad .6. eſt
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proportio dupla: ſed modo quando ſic velocius et
<
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velocius et velocius remittitur ſua velocitas correſ
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pondet intenſiori gradui quã tunc: vt patet ex ter-
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tia propoſitione: igit̄̄ in noſtro caſu b. motus ī illa
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hora ꝑtranſibit pluſ̄ duplū ſpaciū ad ſpaciū ꝑtrã
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ſitum ab a. in eodem tempore. </
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<
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">Quod tamen prima
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fronte videtur mirabile quia in principio motꝰ b.
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eſt duplus ad motum a. adequate et in toto tempo
<
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re perdit motum duplum ad motum quē perdit a.
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tamen bene aſpicienti materiam proportionū ap-
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parebit neceſſarium.</
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</
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ſimaquī
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ta calcu.</
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<
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">Omnis motꝰ tar-
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dius et tardius intenſius quantum ad pertranſitio
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nem ſpacii gradui intenſiori medio correſpondet.
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</
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<
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">Probatur / quia ſi continuo vniformiter talis mo-
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tus (qui ſit a) intenderetur: ipſe preciſe correſpõde-
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ret gradui medio quantum ad pertranſitionē ſpa
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cii / vt patet ex prima propoſitione: ſed modo in quo
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libet inſtanti intrinſeco temporis per quod a. mobi
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le mouetur: mouetur velocius quã tunc: ergo: veloci
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tas eius modo correſpondet gradui intenſiori me-
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dio: quia intenſiori quã tunc. </
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<
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">Conſequentia patet
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et arguitur minor: et volo / b. ſit motus in prīcipio
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hore equalis ipſi a. qui in eadem hora vniformiter
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continuo acquirit equalem latitudinem illi quã ac
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quirit a. adequate ipſo tamē a. tardius et tardius
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continuo acquirente ita ſicut ſunt equales in prī
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cipio ita ſunt equales in fine. </
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<
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">Quo poſito ſic argu-
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mentor / continuo b. motus erit remiſſior ipſo a. mo
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tu et a. motus intenſior: igitur continue a. motꝰ erit
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intenſior quã tunc quãdo continuo vniformiter in-
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tenderetur ſicut b. quia b. et a: tunc ſemper eēnt eq̈-
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les. </
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<
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">Sed iam probo / continuo a. motus erit inten
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ſior b. motu: quia ſi non detur aliqḋ inſtans in quo
<
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non ſed in illo ſit equalis vel remiſſior ipſo b. et ſit
<
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tale inſtans c. terminans vnam quartam gratia ar
<
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gumenti vel quintam: vel ſextam non eſt cura. </
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<
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">Et ar
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guo ſic / in illo inſtanti a. motus et b. motus ſunt eq̈-
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les per te: et in principio erant equales ex caſu et in
<
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tota hora adequate equales latitudīes ſunt eis ac
<
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quiſite: et equales reſtant acquirende poſt illud in-
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ſtans c. et quãtam latitudinem b. acquiſiuit in illa
<
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quarta tantam acquiret in qualibet ſequenti ade-
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quate: quia vniformiter intenditur et a. ex caſu in q̈
<
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libet quarta ſequenti minus acquirit ꝙ̄ in illa pre-
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cedenti c. / vt patet ex caſu quoniã continuo tardius
<
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et tardius acquiret illam latitudinem acquirendã /
<
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igitur in toto tempore ſequenti c. minorem latitudi
<
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nem acquiret quã b. et antea acquiſiuerat equalem:
<
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igitur in toto tempore adequate minorem latitudi
<
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nē acquiret a. quã b. / quod eſt contra caſum: </
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<
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xml:id
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">Et ſic
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probabitur ꝑ locum a maiori / in nullo inſtãti mo
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tus a. eſt remiſſior motu b. </
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<
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xml:id
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xml:space
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">Et ſicut argutum eſt ſu-
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umndo quartam temporis argui poteſt ſumendo
<
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quãcun partem aliquotam vel non aliquotam vĺ
<
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quotcū: et ſic patet proportio. </
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<
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">Et hec eſt quinqua-
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geſima quinta calculatoris</
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<
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<
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">Quinta proportio </
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<
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">Omnis motus tar
<
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dius et tardius deperditus: gradui remiſſiori me-
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dio correſpondet. </
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>
<
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="
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">Probatur hec propoſitio. </
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>
<
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">Sit
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enim a. motus vt .8. qui in hora ſequenti adequate
<
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/>
perdat aliquaꝫ latitudinem in hora ita maneat
<
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/>
in fine minor c. gradu et hoc cõtinuo vniformiter b.
<
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vero ſit motus equalis ipſi a. et perdat in hora ade </
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