Alvarus, Thomas, Liber de triplici motu, 1509

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90 pūcto medii. Tū ſecūdo / q2 tunc ſequeret̄̄ /  nullum
mobile extenſū et vndiqua diuiſibile poſſet vnifor­
miter cõtinuo motū ſuū remittere mediū difforme
tranſeūdo / ſed hoc eſt falſū: igit̄̄ illud ex quo ſequit̄̄
Falſitas cõſequētꝪ ptꝫ: q2 tūc ſequeret̄̄ /  nullū mo-
bile corporeū poſſet motū ſuū cõtinuo vniformiter
remittere mediū īuariatū trãſeūdo: qm̄ oporteret
tale eſſe difforme.
Sequela ꝓbat̄̄ / qm̄ ſi aliqḋ mobi­
le vndiqua diuiſibile poſſet vniformiter cõtinuo
remittere motū ſuū mediū difforme tranſeūdo: ma­
xime eſſet in caſu cõcluſiõis quã īpugnamꝰ: ſed hoc
eſt falſum: igitur nullū mobile corporeū poteſt mo­
tum ſuū cõtinuo vniformiter remittere mediū īua-
riatū trãſeūdo.
Maior ptꝫ: et ſi neges illã: des aliū
caſum.
Et minor probatur / q2 in illo caſu mobile qḋ
mouetur in ſecūdo medio velociꝰ mouetur cotinuo
quã mobile motū in primo medio: igitur in illo ca-
ſu illud mobile nõ vniformiter cõtinuo remittit mo­
tum ſuū, vel ſaltē ſequitur /  ꝓbatio illiꝰ cõcluſiõis
eſt īefficax: q2 principaliter inititur huic fundamē-
to qḋ illa duo mobilia cõtinuo eque velociter mo-
uentur / vt ptꝫ ibi.
Probatur ãtecedes / q2 vt diceba-
tur in argumento prma medietas ſecundi mobilis
mouetur cõtinuo cū mīori reſiſtētia quã ſibi corre-
ſpõdens in mobili qḋ mouetur in primo medio: et
alia medietas ſecūdi mobilis mouetur cõtinuo cuꝫ
equali aut minori reſiſtētia quã medietas ſibi cor-
reſpõdens alteriꝰ mobilis qḋ mouetur in ſcḋo me-
dio / vt probatū eſt: ergo mobile qḋ mouetur in ſcḋo
medio velociꝰ mouetur cõtinuo quã mobile motum
in primo medio.
Patet cõſequentia / q2 ex caſu illa
mobilia ſūt oīno equalis virtutis: igit̄̄ ſi m moue­
tur continuo cum minori reſiſtētia: ip̄m ↄ̨tinuo ve-
lociꝰ mouetur.
¶ Dices forte ad punctū argumenti /
 illud mediū non reſiſtit niſi ſue diuiſioni.
Et ideo
m partes iã diuiſas inter quas eſt mobile tale me­
diū nõ reſiſtit mobili: ſed p̄ciſe m partes diuiden-
das.
Et nõ adhuc m quãlibet diuidendã: ſed p̄ciſe
m lineã vel ſuꝑficiē diuidendã cui ex termitas mo-
bilis eſt ꝓxima: ita  vult hec reſpõſio ymaginari
 cū gladiꝰ aliquid diuidit: partes iã diuiſe inter
quas eſt gladius nõ reſiſtūt gladio ne diuidat ſiue
moueatur diuidendo, nec etiã tota pars q̄ reſtat di­
uidenda reſiſtit illi gladio m ſe et qḋlibet ſui: ſed
p̄ciſe m ſuꝑficiē vel lineã cui ↄ̨tinuo acuties gladii
eſt ꝓxima. 11Calcula.
de reacṫ.
Et huic reſpõſioni videt̄̄ ſuffragari au­
ctoritas calculatoris in capitulo de reactione lo-
co paulo ante allegato.
Sed contra. Tū primo / q2 hec ſolutio
nullo pacto eſt apparens noīali qui huiuſcemodi
ſuperficies et lineas negat.
Tum ſecundo / quia quã­
do aliquid diuiditur per motū localē in duas me-
dietates oportet vtrã illaꝝ medietatū lo­
caliter cedēdo: et tūc vtra illaꝝ medietatū reſiſtit
mobili ne a ſuo loco moueat̄̄.
Tū tertio / q2 tunc ſe-
queretur /  eque facile eſſet diuidere vnã groſſam
trabē ꝑ mediū ſicut vnã paruã partē illius / qḋ tñ eſt
manifeſte falſū et ↄ̨tra expēriētiã.
Sequelã tñ ptꝫ / q2
īſtrumēto diuiſio nõ maior pars reſiſtit cū diui-
dit totã trabē quã cū diuidit paruã partē eiꝰ q2 nõ
niſi ſuꝑficies aut linea ex ſolutiõe. 22pḣus .8.
phi. tex.
cõ. 76.
Tū quarto / quia
motus naturalis factꝰ ꝑ mediū vniforme velocior
eſt in fine quam in principio vt inquit pḣus octauo
phiſicoꝝ textu cõmenti ſeptuageſimi ſexti: cuiꝰ cau­
ſa talis a naturalibꝰ aſſignatur:  illud mediū mi­
nus reſiſtit in fine quã in principio: quia tūc minor
pars eiꝰ reſtat diuidenda: et per ↄ̨ñs magis reſiſtit
magnū mediū quã paruū.
Quod tñ nõ eſſet verum
ſi nõ quelib3 pars medii diuidēdi reſiſteret mobili
diuidenti.
Itē experiūtur natantes in flumine cum
īmergūtur vſ ad fundum: et poſtea iteꝝ ad ſuper­
ficiē aque redeūtes tanto aquã eis minus reſiſtere
quãto ꝓximiores ſunt ſuꝑficiei: qḋ nõ eſſet ſi dūta-
xat ſuperficies illa diuidenda reſiſteret.
Et ideo reſpõdeo ad argumentū ne-
gando añs: et ad ꝓbationē cõceſia maiore negãdo
minorē: et ad ꝓbationē dico breuiter /  oportet di­
cere partes / iam diuiſas nõ reſiſtere illi mobili ſed
dūtaxat ſuꝑficies vel linea diuidenda / vt dictū eſt:
et cū ꝓbatur /  quelibet pars diuidenda reſiſtit: di­
co /  illud apparet michi verū naturaliter loquē-
do.
Ad ſingula em̄ entia naturalia aſpiciēs nullibi
inſtantiã cõperto.
Quapropter et ſi illa cõcluſio et
ſuus modus ꝓbandi nõ cohereat naturalibus ni-
chilominꝰ tamē illa eſt poſſibilis.
Nõ tamē audeo
aſſeuerare nullã potentiã poſſe naturaliter motuꝫ
ſuū cõtinuo vniformiter remittere mediū īuariatū
difforme cõtinuo trãſeūdo: ne numero indoctoruꝫ
aſcribar qui ad pauca reſpiciētes enūciat facile:
33primo ḋ
gñatiõe
tex. cõ. ſe­
ptimi.
teſte pḣo primo de gñatione textu cõmenti ſeptimi
Scḋo / ↄ̨̨tra primã ↄ̨̨cluſionē octaui ca­
pitis arguitur ſic / q2 vbi aliqua potētia nõ varia-
ta idem mediū īuariatū tranſeūdo vniformiter cõ­
tinuo remittit motū ſuū ad non g̈dū: oīs maior ad
extremū intēſiꝰ deueniendo in īfinitū velociter re-
mittit motū ſuū idem mediū tranſeundo: igitur in
tali medio nulla maior vniformiter remittit motū
ſuū.
Cõſequētia eſt nota: qm̄ nulla que vniformiter
remittit motū ſuū in īfinitū velociter remittit mo-
tum ſuū: qm̄ iam non vniformiter remitteret.
Sed
añs eſt quinta cõcluſio ſeptimi capitis huiꝰ tracta­
tus. 44Dicitur.
¶ Dices / et bene diſtinguēdo añs / aut vbi illa po­
tentia maior manet cõtinuo nõ variata, et ſic cõce-
do, aut ſi potētia varietur, et ſic ego nego: et ad ꝓ-
bationē nego /  ſit quīta cõcluſio ſeptī capitis .etc̈.
Dicit em̄ / illa cõcluſio oīs poña maior nõ variata.
Sed cõtra hãc ſolutionē arguitur ſic /
qm̄ vbi illa poña maior variatur iuxta tenorē hu-
ius ṗme ↄ̨cluſiõis: adhuc ipſa in īfinitū velociṫ re-
mittit motū ſuū ſus extremū
ītēſiꝰ deueniēdo: igr̄
ſolutio nulla.
Cõſequētia eſt nota / et argr̄ añs: et ca­
pio vnã potētiã / vt .8. q̄ vniformiṫ cõtinuo nõ varia­
ta c. mediū īcipiēs a duobꝰ et termīatū ad .8. trãſeū­
do remittit motum ſuum ad nõ grdum / et capio vnã
aliã maiorē vt .16. q̄ variata ſufficit vniformiter cõ­
tinuo remittē motū ſuū ad g̈dū totale c. mediū trã­
ſeūdo: ꝑ ſui ↄ̨tinuã ītēſionē / et capio vnã ṫciã poñam
q̄ ſit vt .10. / q̄ nõ variata trãſit idē mediū: et volo /  po­
tētia vt .16. et poña vt .10. ponãtur in prīcipio vltime
q̈rte magis reſiſtētꝪ ipſiꝰ c. medii vtpote in puncto
reſiſtētie vt .4. a quo ſiĺ īcipiãt moueri ſus extre-
mū ītēſiꝰ: q̊ poſito argr̄ ſic / poña vt .16. velociꝰ cõti-
nuo remittit motū ſuū quã poña vt .10. illã q̈rtã trã­
ſeūdo: et potētia vt .10. in īfinitū velociṫ remittit mo­
tū ſuū / vt ptꝫ ex quīta cõcluſiõe ſeptimi capiꝪ p̄alle-
gata: igr̄ poña / vt .16. in īfinitū velociṫ remittit mo­
tū ſuū / qḋ fuit ꝓbãdū.
Ptꝫ ↄ̨ña cū mīore: et argr̄ ma­
ior / q2 cõtinuo maiorē ꝓportionē ꝑdit poña vt .16.
quam potentia vt .10. / igitur potentia vt .16. cõtinue
velocius remittit motū ſuū quã potentia vt .10.
Ar-
guitur antecedens / q2 potentia vt .16. continuo mo­
uetur velociꝰ quã potentia vt .10. qm̄ continuo mo-
uebitur a ꝓportione dupla: et potentia vt .10. nū̄
poſt illū punctū qui eſt vt .5. mouebitur ab illa pro-
portione: igitur cõtinuo potentia vt .16. trãſit par-

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