Alvarus, Thomas
,
Liber de triplici motu
,
1509
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De motu locali quo ad cauſam in medio non reſiſte.
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<
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xml:space
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tie vniformiter difformis ad nõ gradū terminate,
<
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cõtinuo mouēte ſiue ꝓgrediente ꝑ mediū nõ reſiſtēs
<
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ipſa cõtinuo vniformiter difformi manēte et nõ gra
<
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du eius cõtinuo quieſcēte: quodlibet eiꝰ punctū in-
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trinſecū in ea ꝓportione cõtinuo quolibet altero re
<
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miſſiori velocius mouetur in qua eſt ipſo intenſius
<
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</
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<
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xml:space
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">Probat̄̄: ſit a. latitudo reſiſtentie vniformiter dif-
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formis ad nõ gradū terminate, q̄ cõtinuo vniformi
<
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ter difformis manēs ꝓgrediat̄̄ ſucceſſiue ꝑ mediuꝫ
<
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nõ reſiſtēns nõ gradu eiꝰ quieſcēte eo modo quo ſu-
<
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periꝰ declaratū eſt in tertia et quarta ſuppoſitioni
<
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bus p̄cedentis capitis: ſit b. punctꝰ intrinſecꝰ intē
<
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ſior c. vero etiã intrinſecꝰ et remiſſior inter q̄ puncta
<
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ſit proportio f. </
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<
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ꝓportione velocius mouet̄̄ ipſo c. pūcto. </
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<
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xml:space
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">Quod ſic
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oſtendēt̄̄: q2 intēſionis ipſiꝰ b. pūcti ad intēſioni c.
<
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puncti cõtinuo eſt proportio f. ex hypotheſi: et con-
<
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/>
tinuo a. latitudo reſiſtentie manet vniformiter dif-
<
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formis ad nõ gradū terminata: igitur cõtinuo di-
<
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ſtantie quãtitate ipſius b. a nõ gradu ad diſtantiã
<
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ipſius c. a non gradu eſt proportio f. </
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<
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quentia ex diffinitione qualitatis vniformiter dif-
<
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formis quarto tractatu: et continuo diſtantia ipſiꝰ
<
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/>
b. a nõ gradu et diſtantia ipſius c. a nõ gradu maio
<
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/>
rantur per cõtinuū motū ipſius b. et ipſius c. / igitur
<
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/>
cõtinuo diſtantie acquiſite per motum ipſius b. ad
<
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diſtantiã acquiſitã per motū ipſius c. eſt proportio
<
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f. </
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<
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<
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quīte cõcluſionis ſecūdi capitis ſecūde partis: et ꝑ
<
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cõſequens cõtinuo b. punctus in f. proportione ve-
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locius mouetur c. puncto / quod fuit probandum. </
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<
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ſic patet ſuppoſitio.</
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<
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<
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xml:space
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">Latitudine reſi-
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ſtentie vniformiter difformis vtrī ad gradū ter-
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minate, cõtinuo mouēte ſiue ꝓgrediente pēr mediū
<
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/>
nõ reſiſtens, ipſa cõtinuo manente vniformiter dif-
<
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/>
formi et extremo eius remiſſiori quieſcente: quodli-
<
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/>
bet punctū eius intrinſecū in maiori ꝓportione cõ
<
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/>
tinuo quolibet altero intrinſeco remiſſiori velociꝰ
<
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mouetur quã ſit proportio in qua eſt ipſo intenſius
<
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</
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<
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">Probatur: ſit a latitudo reſiſtētie vniformiter dif-
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formis vtrin ad gradum terminate que cõtinuo
<
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manens vniformiter difformis ꝓgrediatur ſucceſſi
<
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ue per medium nõ reſiſtens extremo remiſſiori eius
<
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quieſcente / vt ſepe ſupra dictū eſt. </
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<
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xml:space
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">ſit b. punctus ex
<
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trinſecus intenſior .c. vero etiã intrinſecus et remiſ
<
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ſior, inter que puncta ſit ꝓportio f. </
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<
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">Tunc dico / b.
<
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punctus ↄ̨tinuo in maiore ꝓportione quã f. velociꝰ
<
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continuo mouet̄̄ c. pūcto. </
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<
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">Qḋ ſic oñdit̄̄ / et capio / d. la
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titudinē reſiſtentie vniformiter difformis cõtinuo
<
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eiuſdē extenſionis oīno cū a. incipientē in extremo
<
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/>
intenſiori ab eadē gradu cū a. terminatã tamen ad
<
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/>
nõ gradū: et ſit h. punctus qui tantū diſtat continuo
<
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/>
ab extremo remiſſiori d. latitudinis adequate quã
<
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tum b. diſtat ab extremo remiſſiori ipſius a. latitu-
<
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dinis: et ſit k. pūctus remiſſior h (vt oportet) / qui cõ
<
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tinuo tantū diſtat adequate ab extremo remiſſiori
<
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d. latitudinis quãtū c. diſtat ab extremo remiſſiori
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ipſius a. </
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<
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<
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guo ſic / cõtinuo h. punctus in l. ꝓportione mouetur
<
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velocius k. puncto / vt ptꝫ ex precedenti ſuppoſitiõe.
<
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</
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<
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xml:space
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">Et cõtinuo in eadē l. ꝓportione b. punctus mouetur
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velocius ipſo c. puncto (vt patꝫ intuenti caſum). </
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<
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">Et
<
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intenſionis ipſius h. puncti ad intenſionem ipſius
<
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k. puncti eſt maior ꝓportio quã intenſionis ipſius
<
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b. ad intenſionem ipſius c. puncti que eſt f. ex hypo-
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De motu locali quo ad cauſam in medio non reſiſte.
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theſi: ergo k. ꝓportio eſt maior quã f. ꝓportio et k.
<
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eſt ꝓportio a qua velocius mouetur b. quã c. et f. eſt
<
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ꝓportio intenſionis ipſius b. puncti ad ipſum c. po
<
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tentiarū: ergo b. punctus cõtinuo in maiori ꝓpor-
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tione quam f. velocius mouetur c. puncto: quod fuit
<
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ꝓbandū. </
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<
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">Cõſequentia ptꝫ cū maiore cū prima par
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te minoris. </
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<
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">Et ſecūda pars minoris ꝓbatur videli
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cet / ꝙ̄ intenſionis ipſius h. puncti ad intenſionē etc̈.
<
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quia b. et c. ſunt pūcta intenſiora quã h. et k. / vt ↄ̨ſtat /
<
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et b. minori exceſſu excedit c. quã h. ipſum k. (cum to
<
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tus exceſſus inter extrema d. latitudinis ſit maior
<
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toto exceſſu inter extēa ipſiꝰ a. latitudīs: et ſic inter
<
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extrema partiū equaliū ipſius d. eſt maior exceſſus
<
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quã inter cõſimiles partes ipſius a) / ergo intenſio-
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nis ipſius h. puncti ad intenſionē ipſius k. pūcti eſt
<
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maior ꝓportio quã intenſionis ipſius b. puncti ad
<
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intenſionē ipſius c. puncti que eſt f. / quod fuit infe-
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rendum. </
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<
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</
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<
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<
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">Quandocun ali
<
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que potentie que continuo inequaliter mouetur in
<
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cipiūt in eodem inſtanti moueri / vt attingant eque
<
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cito / et in eodem inſtanti duo mobilia precedētia ta
<
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les potentias que mobilia etiam continuo mouen-
<
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tur recedendo ab ipſis potentiis: et in principio
<
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/>
motus diſtat potentia velocius mota a mobili / qḋ
<
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ipſa inſequitur pluſ̄ reliqua tardius mota a ſuo
<
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in ea ꝓportione qua velocius continuo mouetur:
<
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oportet ſi eque cito debeat vtra potentia ſuū mo
<
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bile attingere: in ꝓportione in qua potentia ve-
<
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locior velociꝰ mouetur potentia tardiore in ea pro
<
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portione mobile quod debet attingi a potētia tar-
<
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diore tardius moueatur quam mobile quod debet
<
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attigi a potentia velociore. </
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<
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">Uolo dicere: ſi ſortes
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et plato incipiant in eodem inſtanti moueri perſe-
<
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quendo ſuos equos fugientes: et ↄ̨tinuo ſortes mo
<
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/>
ueatur in duplo velocius platone: et in inſtanti ini-
<
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/>
tiatiuo motus equus ſortis in duplo plus diſtet a
<
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/>
ſorte quã equꝰ platonis a platone: oportet / equꝰ
<
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/>
platonis (cū plato tardiꝰ moueatur) in duplo tar-
<
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dius moueatur ꝙ̄ equus ſortis: ſi vter ſuū equum
<
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eque cito debeat attingere. </
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<
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">Probatur / ſit a. poten-
<
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tia velocius continuo mota inſequens c. mobile cõ-
<
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tinuo ab ea recedens: et b. potentia continuo tardiꝰ
<
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mota inſequens d. mobile continuo ab ea recedens
<
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diſtet in principio motus a. potētia plus in f. pro
<
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portiõe a c. quã b. ab ipſo d. et in eadem f. ꝓportiõe
<
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a. potētia continuo velocius moueatur ipſa b. po-
<
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tentia: et ſic moueantur continuo vt tandē in eodem
<
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inſtanti quod ſit e. attingant ſua mobilia preceden
<
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tia. </
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<
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">Tunc dico / oportet d. in f. ꝓportione cõtinuo
<
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tardiꝰ moueri ipſo c. </
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<
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">Quod ſic oſtendit̄̄ / q2 cõtinuo
<
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a. mouetur in f. ꝓportione velociꝰ ipſa b. potentia
<
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/>
inſequendo mobilia precedentia vſ ad inſtans e.
<
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/>
ex hypotheſi: igitur ſpacii pertranſiti ab a. poten-
<
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tia vſ ad inſtans e. ad ſpaciū pertranſitū a b. po-
<
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/>
tentia vſ ad idem e. inſtans eſt ꝓportio f. / ptꝫ con-
<
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ſequētia ex ſe: et vltra ſpacii ꝑtrãſiti ab a. potentia
<
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/>
vſ ad inſtãs e. ad ſpaciū ꝑtrãſitū a b. potētia vſ
<
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/>
ad idē inſtãs eſt f. ꝓportio: igr̄ demēdo ab illis ſpa
<
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ciis partes ſe ſi abētes in f. ꝓportione, puta ſpaciū
<
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/>
ꝑ qḋ a principio motꝰ a. diſtat a c. et ſpaciū ꝑ qḋ a
<
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/>
principio motus b. poña diſtat a d. q̄ ex hypotheſi
<
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/>
ſe hñt in f. ꝓportiõe reſidua ſpacia ſe hñt in f. ꝓpor
<
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tione: ptꝫ conſequentia ex ſeptimo correlario quar
<
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/>
te concluſionis oceaui capitis ſecunde partis.</
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<
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xml:id
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xml:space
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">Sed reſidua ſpacia puta reſiduum ſpacii maioris
<
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/>
pertranſiti ab a. et reſiduū ſpacii minoris pertran
<
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/>
ſiti a b. potentia ſunt ſpacia pertranſita a c. mobi </
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