Fabri, Honoré
,
Tractatus physicus de motu locali
,
1646
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<
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214
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026/01/246.jpg
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quadrans ABG in quo ſint duæ chordæ GC, CB: </
s
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<
s
id
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N1D9E1
">Dico quòd per vtram
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que ex G breuiori tempore deſcendit, quàm per inferiorem CB; </
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<
s
id
="
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">quia
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lb
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per CB, & GB æquali tempore deſcendit per Th.27.ſed per GCB bre
<
lb
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uiori tempore deſcendit, quàm per GB; </
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>
<
s
id
="
N1D9EF
">ſit enim GD perpendicularis
<
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parallela AB; </
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>
<
s
id
="
N1D9F5
">ſit ED perpendicularis in CG, & per 3. puncta GCD
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lb
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ducatur circulus: </
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<
s
id
="
N1D9FB
">his poſitis, GH & GC eodem tempore percurrentur,
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lb
/>
& in C idem erit motus, ſiue ex G per GE, ſiue ex E per EC deſcen
<
lb
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dat mobile per Th.27.& 20. ſit autem EB ad EK vt EK ad EC, ſitque
<
lb
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BE v.g, dupla BE vel BA: </
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>
<
s
id
="
N1DA05
">dico EK eſſe æqualem BG; </
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>
<
s
id
="
N1DA09
">eſt autem BH
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maior BC vel AB, vel HG minor CK; </
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<
s
id
="
N1DA0F
">ſit etiam GH ad GI, ita GI
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ad GB: </
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>
<
s
id
="
N1DA15
">dico tempus, quo deſcendit per GCB eſſe ad tempus quo de
<
lb
/>
ſcendit per GB vt GCK ad compoſitam ex GC, HI; </
s
>
<
s
id
="
N1DA1B
">ſed hæc eſt ma
<
lb
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ior illa, vt patet ex Geometria, & analytica; </
s
>
<
s
id
="
N1DA21
">igitur breuiori tempore de
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lb
/>
ſcendit per GCB, quàm per GB; ſed de hoc aliàs. </
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>
</
p
>
<
p
id
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type
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<
s
id
="
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">Sit enim EB 8. dupla ſcilicet AB; </
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>
<
s
id
="
N1DA2D
">ſit autem EE ſubdupla EB ad
<
lb
/>
EK vt EK ad EB; </
s
>
<
s
id
="
N1DA33
">aſſumatur GE, ſitque tempus, quo continetur GC.
<
lb
/>
vt GC, & quo conficitur BC vt CK; </
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>
<
s
id
="
N1DA39
">igitur quo conficitur GCB vt
<
lb
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GCK: </
s
>
<
s
id
="
N1DA3F
">ſimiliter ſit ſecunda linea GB, ſitque tempus, quo percurritur
<
lb
/>
GH vt GC, vel NO æqualis GC, ſitque vt GH ad GN, ita GN ad
<
lb
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GB certè ſi GH decurratur tempore GH, AB decurretur tempore
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HN; </
s
>
<
s
id
="
N1DA49
">ſed HN maior eſt MB, vel CG, vt conſtat ex analytica; </
s
>
<
s
id
="
N1DA4D
">adde quod
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lb
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in figura prima ſit GI ad GM vt GM ad GB; </
s
>
<
s
id
="
N1DA53
">certè ſi tempore GI
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percurratur GI, percurretur GB tempore GM; </
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>
<
s
id
="
N1DA59
">eſt autem GM æqua
<
lb
/>
lis AB, vel EC; </
s
>
<
s
id
="
N1DA5F
">ſimiliter ſit EC ad EK vt EK ad EB, ſi percurratur
<
lb
/>
EC tempore EC, percurretur EB tempore EK; </
s
>
<
s
id
="
N1DA65
">ſed GC percurretur
<
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tempore GC ſed GCK minor eſt GIM; </
s
>
<
s
id
="
N1DA6B
">ſit enim GM. 4. EK R.
<
expan
abbr
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q.
">que</
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>
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32. id eſt, 5 7/8 paulò minùs, quibus ſi ſubtrahas CE 4. & ſubſtituas CG
<
lb
/>
2. paulò plùs habebis 3 7/8; igitur GCK minor eſt GIM. </
s
>
<
s
id
="
N1DA77
">Ex his habes
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omnes Galilei propoſitiones de motu in planis inclinatis numero 38. in
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quo ſtudio, vt verum fatear, maximam ſibi laudem peperit; </
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>
<
s
id
="
N1DA7F
">in quo ta
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men opere duo deſiderari videntur,
<
expan
abbr
="
alterũ
">alterum</
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>
à Philoſophis, quod ita phyſi
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cæ partes omnes neglexerit, vt ferè vni Geometriæ ſatisfaceret; alterum
<
lb
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ab Geometris quod Geometriam equidem accuratè tractarit. </
s
>
<
s
id
="
N1DA8D
">Sed minùs
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ad captum Tyronum: atque hæc de his ſint ſatis, vt tandem noſtrorum
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Theorematum ſeriem interruptam repetamus. </
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>
</
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<
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<
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Theorema
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31.
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Ex dictis ſequitur pondus centum librarum poſſe habere tantùm grauitatio
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nem vnius libræ
<
emph.end
type
="
italics
"/>
; </
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>
<
s
id
="
N1DAB0
">ſit enim planum inclinatum centuplum horizontalis, id
<
lb
/>
eſt, ſecans centupla Tangentis; haud dubiè grauitatio in prædictum pla
<
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/>
num erit tantùm ſubcentupla per Th.16. </
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>
</
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<
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Theorema
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type
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32.
<
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type
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</
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Ex duobus ferentibus idem parallelipedum in ſitu inclinato poteſt alter fer
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/>
re tantùm vnam libram, licèt pendat centum libras
<
emph.end
type
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italics
"/>
; </
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<
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id
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">ſit enim ita inclina-</
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