Fabri, Honoré
,
Tractatus physicus de motu locali
,
1646
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<
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408
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tum primum puncti AC, & totius axis AB, quamdiu deſcendit vterque,
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eſſe æqualem; </
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<
s
id
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N28BA8
">quod tamen dici non poteſt, quia conatus ſingulorum
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punctorum ſeorſim ſunt æquales; </
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<
s
id
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N28BAE
">ſed conatus omnium coniunctim eſt
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maior conatu ſingulorum; </
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<
s
id
="
N28BB4
">nam ſingula habent ſuum impetum; verum
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eſt quidem moueri motu æquali, quia ſingula æquali impetu mouentur. </
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<
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Tertiò, quia vult poſito cylindro ſupra baſim 4. illam immediatè premi
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à puncto EB, hoc verò punctum à puncto DE, & hoc ab CD, & hoc ab
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AC; </
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<
s
id
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N28BC3
">quod tamen dici non poteſt; quis enim dicat granulum ſuperpoſi
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tum rupi in illam grauitare? </
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<
s
id
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N28BC9
">Equidem cum illa grauitat grauitatione
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communi, vt dictum eſt ſuprà, non tamen in illam. </
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>
<
s
id
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N28BCE
">Quartò, quia dicit
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pumum B cum conatu totius cylinèri incubantis eo tempore, quo pun
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ctum AC conficeret AC, conficere AB, quod repugnat progreſſioni
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Galilei, quam ſequitur ipſe; </
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<
s
id
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N28BD8
">quia conatus ſunt, vt velocitates; </
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<
s
id
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N28BDC
">hæ verò
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vt tempora; ſed ſpatia in ratione duplicata temporum. </
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</
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<
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id
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type
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<
s
id
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">Denique non video, quomodo ex his etiam datis demonſtret pro
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portionem quæſitam percuſſionis, & grauitationis; </
s
>
<
s
id
="
N28BEA
">igitur non eſt conſu
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lb
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lendum ſpatium, ſed tempus eo modo, quo diximus; </
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>
<
s
id
="
N28BF0
">ſi enim punctum
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lb
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moueatur per 1000. inſtantia, acquiret mille puncta impetus; </
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>
<
s
id
="
N28BF6
">igitur ha
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bebit 1001. igitur ſi aſſumatur corpus, quod conſtet 1001. punctis habe
<
lb
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bit 1001. puncta impetus, id eſt ſingula in ſingulis; quæ cum omnia gra
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uitent grauitatione communi, æqualis eſt priori effectus. </
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<
s
id
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N28C02
">Decimoſextò, hinc vides, quàm ſit difficilis, vel potiùs impoſſibilis
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huius proportionis inuentio, ex cuius cognitione tempus reſoluitur in
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ſua inſtantia, immò & quantitas in ſua puncta: primum quidem; </
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>
<
s
id
="
N28C0A
">ſit enim
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data moles, cuius grauitatio æqualis eſt ictui alterius cadentis dato
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tempore; haud dubiè tot ſunt inſtantia in toto illo tempore, quoties
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pondus cadens continetur in grauitante, vt patet ex dictis. </
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>
</
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<
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id
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type
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<
s
id
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N28C16
">Decimoſeptimò, poteſt aſſumi perexigua pars temporis pro inſtanti
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phyſico, nec tam ſenſibilis erit error, & modicum ſpatium pro puncto
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phyſico, vt deinde mechanicè procedatur ad indagandam hanc propor
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tionem percuſſionis, & grauitationis. </
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id
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type
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<
s
id
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N28C21
">Decimooctauò, poteſt explicari quomodo defigatur palus ab ictu
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corporis deorſum cadentis. </
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>
<
s
id
="
N28C26
">Primò enim, ideò defigitur, quia materia
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mollior cedit non ſine aliqua compreſſione. </
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>
<
s
id
="
N28C2B
">Secundò, hinc in mucro
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nem deſinere debet, vt faciliùs penetret, quod ad cuneum reducemus
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alibi: idem dico de ſecuri, gladio, enſe, &c. </
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>
<
s
id
="
N28C33
">Tertiò, initio faciliùs
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defigitur, conſtat experientiâ; ratio eſt, quia plures partes deinde com
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/>
primuntur propter longitudinem, & craſſitudinem pali ſeu claui. </
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>
<
s
id
="
N28C3B
">Quar
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tò, hinc minùs defigitur ſecundo ictu, quàm primo; </
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>
<
s
id
="
N28C41
">igitur maiore niſu
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opus eſt: </
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>
<
s
id
="
N28C47
">in qua verò proportione difficilè dictu eſt; inueniri tamen po
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teſt de qua numero ſequenti. </
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>
<
s
id
="
N28C4D
">Quintò, poteſt etiam dici vel poſito ſe
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cundô ictu æquali primo quantum defigat ſupra primum, vel poſita de
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fixione illa, qua defigitur ſecundo ictu æquali primæ, quam proportio
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nem habeant ictus. </
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>
<
s
id
="
N28C56
">Tertiò, poſito vtroque inæquali, quæ ſit etiam vtriuſ
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que proportio. </
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>
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