Fabri, Honoré
,
Tractatus physicus de motu locali
,
1646
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<
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311
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026/01/345.jpg
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quo percurretur DE, percurretur pluſquam DN; </
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<
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id
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N23836
">quippe DN eſt minùs
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inclinatus, quàm DE: </
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<
s
id
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N2383C
">porrò recta NH eodem deinde tempore percur
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retur, ſiue ducatur initium motus AD per arcum DN, ſiue AD per re
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ctam DN, ſiue ab O per rectam ON; quia in N eſt æqualis velocitas
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per Lemm. </
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<
s
id
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N23846
">11. igitur tempus, quo percurritur recta NH, facto initio
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motus ex D per rectam, vel arcum DN, eſt ad tempus, quo percurritur
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DN, vt 42466.ad DN, id eſt ad 390181. ſit enim vt ON ad 111347.
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ita hæc ad OH 179995. detrahatur ON ex 111347.ſupereſt 42466.igi
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tur eo tempore, quo percurritur DE, percurritur pluſquam DN; </
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<
s
id
="
N23852
">per
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curritur tamen minùs, quàm DL; </
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<
s
id
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N23858
">quia tempus, quo percurritur DL eſt
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ad tempus quo percurritur LH facto initio motus in D, vt DL 51764.
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ad 41422. igitur eo tempore, quo percurritur DE; percurritur minùs
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quàm DL. </
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</
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<
p
id
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N23862
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main
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<
s
id
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N23864
">Adde quod rectæ DE, DM, æquali tempore percurruntur; </
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<
s
id
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N23868
">ſed DM
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breuiore tempore percurritur, quàm arcus DL, immò arcus DE citiùs
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peragitur, quàm recta DE; </
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<
s
id
="
N23870
">igitur citiùs quàm arcus DL; </
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<
s
id
="
N23874
">ſi verò acci
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piatur arcus DR; </
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<
s
id
="
N2387A
">certè tempus per arcum DE eſt paulò minus tempo
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re per arcum DR; quia tempus, quo percurritur DR eſt ad tempus, quo
<
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percurretur RH, facto initio motus in D, vt 45444.ad 41705.ſed vtrum
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que tempus debet eſſe æquale, vt ſcilicet arcus in DH æquali tempore
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cum arcu DE percurratur. </
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<
s
id
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N23888
">Obſeruabis præterea, vt inueniatur arcus quadrantis DH, cuius tem
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pus ſit ſubduplum ipſius quadrantis, vel æquale tempori per arcum DE,
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aſſumendum eſſe punctum in arcu DH, puta N; </
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<
s
id
="
N23890
">per quod ſi ducatur
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HNO, ſitque vt ON ad OV, ita OV ad OH, ipſa NV erit æqualis
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ipſi ND; </
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<
s
id
="
N23898
">quippè tempus per DN eſt ad tempus per ON, vt ipſa DN ad
<
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ON; </
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>
<
s
id
="
N2389E
">ſed tempus per ON eſt ad tempus per NH, vt ON ad NV; </
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>
<
s
id
="
N238A2
">igi
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tur tempus per DN eſt ad tempus per NH, vt DN ad NV; </
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>
<
s
id
="
N238A8
">igitur DN,
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& NH facto initio motus à D fiunt tempore æquali; </
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<
s
id
="
N238AE
">ſed vt tempus per
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rectam DN ad tempus per rectam NH; </
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<
s
id
="
N238B4
">ita tempus per duas DXN ad
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tempus per duas NZH; </
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>
<
s
id
="
N238BA
">ita tempus per 4. æquales inſcriptas arcui DN
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ad tempus per 4.æquales inſcriptas arcui NZH, atque ita deinceps; igi
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tur ita tempus per arcum DN ad tempus per arcum NZH. </
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<
s
id
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N238C4
">Quomodo verò poſſit inueniri punctum N, viderint Geometræ; </
s
>
<
s
id
="
N238C8
">nec
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enim phyſici eſt inſtituti; habetur autem ex analytica, ſi excipiatur ar
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cus DN. 24. gra. </
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>
<
s
id
="
N238D0
">20′. </
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>
<
s
id
="
N238D3
">circiter; ſitque HO ſecans anguli AHO grad.57.
<
lb
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10′. </
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>
<
s
id
="
N238D8
">ſitque ON, ad OV vt OV ad OH, ipſa NV erit proximè æqualis
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ipſi ND: igitur DN. & NH æqualibus temporibus percurrentur. </
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<
s
id
="
N238DE
">Simili
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ter opera eiuſdem analyticæ habebitur arcus, qui peragitur in DZH eo
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tempore, quo arcus DNF percurritur, poſſuntque hæc omnia in cano
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nes redigi. </
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Theorema
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10.
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In diuerſis punctis arcus diuerſus impetus producitur.
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<
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N238FE
"> Prob. </
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<
s
id
="
N23901
">ſit enim
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pendulum fune ex centro immobili A; </
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<
s
id
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N23907
">ſitque AO horizontalis, AD </
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