Fabri, Honoré
,
Tractatus physicus de motu locali
,
1646
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<
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<
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<
chap
id
="
N22A20
">
<
p
id
="
N236FB
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type
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main
">
<
s
id
="
N2370C
">
<
pb
pagenum
="
310
"
xlink:href
="
026/01/344.jpg
"/>
ſu BF eſſe ad acquiſitam in deſcenſu HP, vt vecta AF ad rectam OF,
<
lb
/>
quod facilè probatur; </
s
>
<
s
id
="
N23717
">quia ex B in F æqualis acquiritur velocitas ſiue
<
lb
/>
per rectam BF
<
expan
abbr
="
deſcẽdat
">deſcendat</
expan
>
mobile, ſiue per duas BHF, ſiue per tres BHGF,
<
lb
/>
ſiue per totum quadrantem BHF; </
s
>
<
s
id
="
N23723
">ſed æqualis eſt acquiſita per BF ac
<
lb
/>
quiſitæ per AF, vel BE; </
s
>
<
s
id
="
N23729
">quæ omnia conſtant per Lemm.10.& 11.ſimili
<
lb
/>
ter acquiſita in recta HF eſt æqualis acquiſitæ in recta OF in duabus
<
lb
/>
HGF; </
s
>
<
s
id
="
N23731
">immò & in arcu HZF; </
s
>
<
s
id
="
N23735
">igitur acquiſita in arcu BHF eſt ad
<
lb
/>
acquiſitam in arcu HZF, vt acquiſita in AF ad acquiſitam in OF; </
s
>
<
s
id
="
N2373B
">ſed
<
lb
/>
illa eſt ad hanc vt AF ad OF, vt conſtat; igitur ſunt vt altitudines, quod
<
lb
/>
erat probandum. </
s
>
</
p
>
<
p
id
="
N23743
"
type
="
main
">
<
s
id
="
N23745
">Hinc non ſunt vt chordæ, neque vt arcus; </
s
>
<
s
id
="
N23749
">hinc acquiſita in arcu
<
lb
/>
BHF eſt dupla acquiſitæ in arcu HZF; </
s
>
<
s
id
="
N2374F
">cùm tamen arcus BF non ſit
<
lb
/>
duplus; ſed ſeſquialter arcus HZF. </
s
>
</
p
>
<
p
id
="
N23755
"
type
="
main
">
<
s
id
="
N23757
">
<
emph
type
="
center
"/>
<
emph
type
="
italics
"/>
Theorema
<
emph.end
type
="
italics
"/>
7.
<
emph.end
type
="
center
"/>
</
s
>
</
p
>
<
p
id
="
N23763
"
type
="
main
">
<
s
id
="
N23765
">
<
emph
type
="
italics
"/>
Hinc ſunt diuerſi ictus inæqualium vibrationum in eadem altitudinum ra
<
lb
/>
tione
<
emph.end
type
="
italics
"/>
; </
s
>
<
s
id
="
N23770
">quia eadem eſt ratio ictuum, quæ velocitatum acquiſitarum in
<
lb
/>
puncto percuſsionis; </
s
>
<
s
id
="
N23776
">ſed ratio velocitatum eſt eadem quæ altitudinum,
<
lb
/>
ſeu perpendicularium per Th.7. igitur eadem ratio ictuum, quæ altitu
<
lb
/>
dinum; </
s
>
<
s
id
="
N2377E
">ſed inæqualium vibrationum eiuſdem funependuli diuerſæ ſunt
<
lb
/>
altitudines; igitur diuerſi ictus, quod erat demonſtrandum. </
s
>
</
p
>
<
p
id
="
N23784
"
type
="
main
">
<
s
id
="
N23786
">
<
emph
type
="
center
"/>
<
emph
type
="
italics
"/>
Theorema
<
emph.end
type
="
italics
"/>
8.
<
emph.end
type
="
center
"/>
</
s
>
</
p
>
<
p
id
="
N23792
"
type
="
main
">
<
s
id
="
N23794
">
<
emph
type
="
italics
"/>
In diuerſis funependulis ſimilium vibrationum velocitates ſunt vt chordæ
<
emph.end
type
="
italics
"/>
; </
s
>
<
s
id
="
N2379D
">
<
lb
/>
ſint enim duo funependula inæqualis A
<
foreign
lang
="
grc
">ρ</
foreign
>
, AF; </
s
>
<
s
id
="
N237A6
">certè ſit vibratio maio
<
lb
/>
ris BF, & minoris vibratio ſimilis
<
foreign
lang
="
grc
">α ρ</
foreign
>
, velocitas vibrationis BF eſt vt al
<
lb
/>
titudo AF & minoris
<
foreign
lang
="
grc
">α ρ</
foreign
>
, vt altitudo A
<
foreign
lang
="
grc
">ρ</
foreign
>
; </
s
>
<
s
id
="
N237BA
">ſed vt AF eſt ad A
<
foreign
lang
="
grc
">ρ</
foreign
>
, ita BF
<
lb
/>
ad
<
foreign
lang
="
grc
">α ρ</
foreign
>
; </
s
>
<
s
id
="
N237C8
">ſunt enim triangula proportionalia; </
s
>
<
s
id
="
N237CC
">idem dico de aliis.v.g ZF
<
lb
/>
& X
<
foreign
lang
="
grc
">ρ</
foreign
>
, iu quo non eſt difficultas: hinc percuſsiones vtriuſque erunt etiam
<
lb
/>
vt chordæ, quia ſunt vt altitudines. </
s
>
</
p
>
<
p
id
="
N237D8
"
type
="
main
">
<
s
id
="
N237DA
">
<
emph
type
="
center
"/>
<
emph
type
="
italics
"/>
Theorema
<
emph.end
type
="
italics
"/>
9.
<
emph.end
type
="
center
"/>
</
s
>
</
p
>
<
p
id
="
N237E6
"
type
="
main
">
<
s
id
="
N237E8
">
<
emph
type
="
italics
"/>
Tempora, quibus peraguntur vibrationes ſimiles funependulorum inæqua
<
lb
/>
lium ſunt ferè in ratione ſubduplicata longitudinum, ſeu radiorum
<
emph.end
type
="
italics
"/>
: </
s
>
<
s
id
="
N237F3
">Probatur,
<
lb
/>
quia tempora deſcenſuum per chordas ſimiles ſunt in ratione ſubdupli
<
lb
/>
cata earumdem chordarum, ſiue ſint 2.ſiue ſint tres, & per Lemma 17.
<
lb
/>
ſed ſi accipiantur plures chordæ, tandem habebitur arcus; </
s
>
<
s
id
="
N237FD
">igitur vibra
<
lb
/>
tio per arcum eſt veluti deſcenſus per infinitas ferè chordas æquales; </
s
>
<
s
id
="
N23803
">ſed
<
lb
/>
tempora horum deſcenſuum ſunt in ratione ſubduplicata chordarum; </
s
>
<
s
id
="
N23809
">&
<
lb
/>
hæc eſt eadem ratio cum ſubduplicata radiorum; igitur tempora vibra
<
lb
/>
tionum ſimilium ſunt ferè in ratione ſubduplicata radiorum. </
s
>
</
p
>
<
p
id
="
N23811
"
type
="
main
">
<
s
id
="
N23813
">Obſeruabis rem
<
expan
abbr
="
iſtã
">iſtam</
expan
>
accuratè, & analyticè diſcuti poſſe, ſit enim qua
<
lb
/>
drans ADH maioris vibrationis, & quadrans CED minoris; </
s
>
<
s
id
="
N2381D
">ſitque
<
lb
/>
CD ſubquadrupla AD, & arcus DE ſubquadruplus DKH; </
s
>
<
s
id
="
N23823
">aſſumatur
<
lb
/>
DN ſubquadruplus DH; </
s
>
<
s
id
="
N23829
">ſitque DN æqualis DE; </
s
>
<
s
id
="
N2382D
">certè eo tempore, </
s
>
</
p
>
</
chap
>
</
body
>
</
text
>
</
archimedes
>