Alvarus, Thomas
,
Liber de triplici motu
,
1509
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Table of Notes
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Primi tractatus
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illatum / quia aut illud medium d. eſt medium pri-
<
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mo modo puta trahens mobile cuiuſmodi eſt na-
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uis aut aqua trahens natantem / et ſic ego nego ſe
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quelam. </
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<
s
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N174B7
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xml:space
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">Dico enim / tale mobile quod ꝑ tale me
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dium mouetur: mouetur tota velocitate qua mo-
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uetur ipſum mediū et inſuper velocitate propria:
<
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/>
et ſic aggregatum ex illis duabus velocitatibus
<
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/>
conſtituit velocitatem maiorē velocitate qua mo-
<
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/>
uetur ipſum mobile per rarefactionem. </
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>
<
s
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xml:space
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">Et ſic põt
<
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ſemper pertingere quamdiu mouetur: aliqḋ pun
<
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/>
ctum precedens ipſuꝫ. </
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>
<
s
xml:id
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N174CB
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xml:space
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preserve
">quoniam quãdiu mouetur
<
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intenſiori velocitate (computatis vtriuſ velocita
<
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/>
tibus) mouetur quã aliquod punctum precedens
<
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/>
ipſum. </
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<
s
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N174D4
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xml:space
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">Sed cū motu proprio deuenerit ad nõ gra
<
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/>
dum mouebitur a medio dūtaxat / et ſemper mane
<
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/>
bit in eodem puncto medii. </
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>
<
s
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N174DB
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xml:space
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">Si vero medium d. ſit
<
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medium ſecundo modo non trahens ipſum mobi
<
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/>
le concedo illatum / et ad probationem dico / non
<
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/>
habeo pro inconuenienti quando vna illarum re
<
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ſiſtentiarum mouetur et alia quieſcit </
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<
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xml:space
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">Ibi enim ce
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tera non ſunt paria. </
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<
s
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xml:space
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">¶ Hec argumenta partim
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ſunt ex calculatore traducta: que ideo huic operi ī
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terſerui quoniam aliquid ſubtilitatis et difficul-
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tatis pre ſe ferunt. </
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<
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xml:space
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">Tum etiam vt redderetur ipſe
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calculator peruius et vadis plenus.</
s
>
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<
head
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xml:space
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">Septimum capitulum / in quo inquiri
<
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tur: vtrum aliqua potentia non varia-
<
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/>
riata per medium vniforme aut diffor-
<
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/>
me, vniformiter ad non gradum vel ad
<
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/>
gradum ſuum motum remittere aut in
<
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tendere valeat.</
head
>
<
p
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<
s
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N1751C
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xml:space
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">ÃTea materia que ī titulo hu
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ius capitis tangitur valeat clare expe
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diri: ponam aliquas concluſiones qui
<
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bus probandis vnicam duobus correlariis adiū
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ctam ſuppoſitionem premittam. </
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<
s
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xml:space
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">Que talis eſt.</
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<
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xml:space
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">Si b. latitudo motus minor a. ma
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/>
ior diminuantur vniformiter in tempore equali
<
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/>
vel inequali perdendo adequate equalem latitu-
<
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/>
dinem motus: maior eſt proportio motus b. in pri
<
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/>
ma medietate temporis in quo ipſum b. diminui-
<
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/>
tur ad ſeipſum in ſecunda medietate eiuſdem tem
<
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/>
poris, quam ſit motus a. in prima medietate tem
<
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/>
poris in quo ipſum a. diminuitur ad ſeipſum ī ſe-
<
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/>
cunda medietate eiuſdem tēporis. </
s
>
<
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xml:space
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">Patet hec ſup
<
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poſitio ex ſecunda parte ſecundi correlarii prime
<
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/>
concluſionis vltimi capitis ſecunde partis / hoc ad
<
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/>
dito / motus vniformiter difformis et vniformi-
<
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/>
ter remiſſus correſpondet motui exiſtēti in medio
<
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/>
inſtanti temporis / in quo remittitur vniformiter:
<
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/>
quia talis motus eſt ſuus gradus medius.
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xml:space
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">1. correl.</
note
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</
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<
s
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xml:space
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">¶ Ex
<
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quo ſequitur primo / ſi b. potentia minor in ali-
<
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/>
quo tempore c. medium tranſeundo vniformiter
<
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remittet motū ſuum. </
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<
s
xml:id
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xml:space
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">et a. potentia maior in tempo
<
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re minori (vt opꝫ) idē c. mediū trãſeūdo vniformiṫ
<
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/>
remittit motum ſuum: maior eſt ꝓportio velocita
<
lb
/>
tis ipſius b. in prima medietate tēporis in quo b.
<
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/>
vniformiter remittit motum ſuum ad velocitateꝫ
<
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/>
ſecunde medietatis eiuſdem temporis quam velo
<
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/>
citatis ipſius a. ī prima medietate temporis ī quo
<
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/>
idem a. vniformiter remittit motum ſuum ad velo
<
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citatem ſecunde medietatis eiuſdē temporis. </
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<
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xml:space
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">Pa
<
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tet hoc correlarium ex ſuppoſitione / quia quando
<
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/>
b. potentia minor vniformiter remittit motū ſuū
<
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/>
in aliquo tempore c. medium tranſeundo: et a po-
<
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/>
tentia maior in tempore minori etiam vniformi-
<
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/>
ter remittit motum ſuum: iam latitudo motꝰ qua
<
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/>
mouetur b. potentia minor et latitudo motus ma
<
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Capitulum ſeptimum
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ior qua mouetur a. potentia maior in tempore eq̈
<
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/>
li vel inequali diminuuntur vniformiter equalem
<
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/>
latitudinem adequate deperdendo / ergo maior ē
<
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/>
proportio motus ſiue velocitatis ipſius b. / in pri-
<
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/>
ma medietate temporis in quo ipſum b. vniformi
<
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/>
ter remittit motum ſuum ad motum / quo idem b.
<
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/>
mouetur in ſecunda medietate eiuſdem temporis /
<
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/>
quam ſit proportio motus ipſius a. / in prima me-
<
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/>
dietate temporis in quo vniformiter remittit mo
<
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tum ſuum ad motum in ſecunda medietate eiuſdē
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temporis. </
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">Conſequentia patet ex ſuppoſitione et
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antecedens ex iſta concluſione. </
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<
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N17599
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xml:space
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">Diuerſe potentie
<
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inuariate idem medium inuariatum tranſeuntes
<
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</
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<
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xml:space
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">(Nam de inuariatis potentiis et medio inuaria-
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to eſt ſermo) / in quo medio acquiritur aut deperdi
<
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tur motus equalem latitudinem motus acquirūt
<
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/>
vel deperdunt.
<
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note-0074-02a
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note-0074-02
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xml:id
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xml:space
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">2. correl.</
note
>
</
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<
s
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xml:space
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">¶ Ex quo ſequitur ſecundo / ſi b.
<
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potētia minor in d. tempore c. medium tranſeūdo
<
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/>
vniformiter remittit motū ſuū: et a. potētia maior
<
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/>
in e. tempore mouendo equalem latitudinem mo-
<
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/>
tus vniformiter deperdit adequate ſicut b. / tunc ſi
<
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/>
velocitatis b. in prima medietate d. temporis ad
<
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/>
velocitatem eiuſdē b. in ſecunda medietate eiuſdē
<
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temporis ſit f. proportio: minor proportio erit ve
<
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/>
locitatis a. in prima medietate e. temporis ad ve-
<
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locitatem a. in ſecunda medietate eiuſdē temporis
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quam f. ꝓportio. </
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<
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poſitione.</
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</
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<
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">His premiſſis ſit prima cõcluſio. </
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<
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xml:space
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">Ali
<
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qua potentia non variata ſemper tranſeundo re-
<
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ſiſtentiam vniformē: vniformiter continuo remit-
<
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tit motum ſuum ad non gradum et ad gradum.</
s
>
</
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<
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xml:space
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">Probatur hec concluſio / et volo / ſit aliquod me
<
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dium vniforme reſiſtens vt .4. et potentia vt .8. q̄
<
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/>
non variata moueatur per illud: ſic tamen illḋ
<
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/>
medium creſcat in reſiſtentia vniformiter ꝓportio
<
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nabiliter per totum. </
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>
<
s
xml:id
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N175F2
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xml:space
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">ita inequalibus tempori-
<
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/>
bus equales proportiones reſiſtentiarum acqui-
<
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rat per totum / quo ad ſit reſiſtentia vt .8. / quo poſi-
<
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/>
to illud mobile tranſeundo illud medium remit-
<
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/>
tit motum ſuum vniformiter primo ad certū gra-
<
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dum deinde ad non gradum / igitur concluſio ve-
<
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ra. </
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<
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xml:space
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">Antecedens probatur / quoniam reſiſtentia creſ
<
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ſcit ſemper eque proportionabiliter / igitur poten
<
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/>
tia non variata mouens per eam vniformiter mo
<
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/>
tum ſuū / remittit ſiue ad gradum ſiue ad non gra-
<
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dum. </
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<
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xml:space
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">Patet conſequētia ex ſexta et quarta ſuppo
<
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ſitionibus quīti capitis huius tractatus coniunc
<
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tis. </
s
>
<
s
xml:id
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N17613
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xml:space
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">¶ Hic tamen tu aduerte / quãuis illa potētia
<
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/>
non variata ſemꝑ mouetur per medium vniforme /
<
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/>
hoc eſt per medium / quod in quolibet īſtanti tem-
<
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poris in quo mouetur eſt vniforme: per nullum ta
<
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/>
men mediū aliqua vniformitate vniforme ſemper
<
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mouetur / quia illḋ medium continuo habet aliam
<
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/>
et aliaꝫ vniformitatē.
<
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right
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xlink:href
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note-0074-03a
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note-0074-03
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xml:id
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xml:space
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">corelar.</
note
>
</
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<
s
xml:id
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xml:space
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">¶ Ex quo ſequitur / aliqua
<
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potentia non variata ſemper tranſeūdo medium /
<
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/>
quod in quolibet inſtanti temporis in quo moue-
<
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/>
tur eſt vniforme: vniformiter intendit motum ſuuꝫ
<
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</
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<
s
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xml:space
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">Patet / ſi illa potentia vt .8. incipiat moueri per
<
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/>
reſiſtentiam vt .8. vniformiter proportionabili-
<
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/>
ter in reſiſtentia decreſcentem per totum.</
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<
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">Secunda concluſio </
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<
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xml:space
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">Aliqua potentia
<
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non variata pertranſeundo mediuꝫ difforme: vni
<
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formiter remittit motum ſuum et ad gradum et ad
<
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non gradum. </
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>
<
s
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N1764F
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xml:space
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preserve
">Probatur hec concluſio et capio
<
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duo media equalia quorum vtrū ſit reſiſtētie vt
<
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/>
4. per totum: et volo / fiat de vno illorum omni-
<
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/>
no eodem modo ſicut ponitur in precedenti cõclu </
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