Fabri, Honoré
,
Tractatus physicus de motu locali
,
1646
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1 - 30
31 - 60
61 - 90
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121 - 150
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241 - 270
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361 - 390
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451 - 480
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<
chap
id
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N270EE
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<
pb
pagenum
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409
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xlink:href
="
026/01/443.jpg
"/>
<
p
id
="
N28C5F
"
type
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main
">
<
s
id
="
N28C61
">Decimononò, ſi æqualis ſit ſecundus ictus. </
s
>
<
s
id
="
N28C64
">Primò, poteſt determina
<
lb
/>
ri proportio iuxta quam defigitur palus, quod vt melius explicetur, ſit
<
lb
/>
cuneus BE, cuius ſolidum facilè demonſtratur; </
s
>
<
s
id
="
N28C6C
">eſt enim ſubduplum pa
<
lb
/>
rallelipedi, cuius baſis ſit quadratum AC, & altitudo RE; </
s
>
<
s
id
="
N28C72
">ſi enim trian
<
lb
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gulum ADE ducatur in latus AB vel EF habebitur ſolidum cunci, vt
<
lb
/>
conſtat, vnde cunei eiuſdem latitudinis ſunt, vt triangula, v.g. cuneus A
<
lb
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F ad eumdem YF; </
s
>
<
s
id
="
N28C7E
">vt triangulum ADE ad triangulum YHE: </
s
>
<
s
id
="
N28C82
">hoc po
<
lb
/>
ſito ſit triangulum MKN æqualis ADF, & primo ictu tota EI vel N
<
lb
/>
Z ſecundo ictu defigitur, non quidem æquali altitudine, ſed æquali ſoli
<
lb
/>
do; </
s
>
<
s
id
="
N28C8C
">cùm autem triangulum XZN ſit ſubquadruplum trianguli QON
<
lb
/>
ſit media proportionalis N inter NZNO, triangulum N
<
foreign
lang
="
grc
">β</
foreign
>
Y eſt du
<
lb
/>
plum NZX; </
s
>
<
s
id
="
N28C98
">igitur ſecundo ictu defigetur N
<
foreign
lang
="
grc
">β</
foreign
>
: </
s
>
<
s
id
="
N28CA0
">ſimiliter ſi vt NZ ad N
<
lb
/>
<
foreign
lang
="
grc
">β</
foreign
>
, ita N
<
foreign
lang
="
grc
">β</
foreign
>
ad N. Tertio, ita defigetur NT, & quarto NO dupla NI: ra
<
lb
/>
tio eſt, quia æquales ictus æquales habent effectus. </
s
>
</
p
>
<
p
id
="
N28CAF
"
type
="
main
">
<
s
id
="
N28CB1
">Vigeſimò, ſi æquales accipiantur altitudines ſingulis ictibus, ictus
<
lb
/>
ſunt in ratione duplicata altitudinum, ſuppoſitâ prædicta hypotheſi cunei
<
lb
/>
v.g.ſi dato ictu defigatur NZ, & altero NO, ſecundus eſt ictus quadruplus
<
lb
/>
primi; </
s
>
<
s
id
="
N28CBB
">ſi verò tertio ictu defigatur N
<
foreign
lang
="
grc
">θ</
foreign
>
tripla NZ, ictus eſt ad primum
<
lb
/>
in ratione 9/1. ſi denique dato ictu defigatur NM, ictus eſt ad primum
<
lb
/>
in ratione 36/3, vt patet ex dictis; ſi verò primo ictu defigatur NZ, ſecundo
<
lb
/>
ZO, tertio O
<
foreign
lang
="
grc
">θ</
foreign
>
, quarto
<
foreign
lang
="
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">θ</
foreign
>
M, ictus ſunt, vt numeri impares 1.
<
lb
/>
3. 7. 9. </
s
>
</
p
>
<
p
id
="
N28CD5
"
type
="
main
">
<
s
id
="
N28CD7
">Vigeſimoprimò, hinc ſi dentur duo ictus, & eorum proportio deter
<
lb
/>
minari, vt poteſt proportio altitudinum, quæ defiguntur, quæ ſunt in
<
lb
/>
ratione ſubduplicata ictuum, ſuppoſito cuneo: </
s
>
<
s
id
="
N28CDF
">ſimiliter, ſi dentur alti
<
lb
/>
tudines, carumque proportio, determinari poteſt proportio ictum; </
s
>
<
s
id
="
N28CE5
">ſunt
<
lb
/>
enim in ratione duplicata, vt patet ex dictis; porrò vtrumque poteſt
<
lb
/>
conſiderari duobus modis. </
s
>
<
s
id
="
N28CED
">Primò, coniunctim, ſi ſecundus ictus ſucce
<
lb
/>
dat primo, & eius altitudinem augeat. </
s
>
<
s
id
="
N28CF4
">Secundò, ſi ſeorſim vterque
<
lb
/>
conſideretur, &c. </
s
>
</
p
>
<
p
id
="
N28CF9
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type
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main
">
<
s
id
="
N28CFB
">Vigeſimoſecundò, in clauis, vel conis altitudines ſunt in ratione
<
lb
/>
ſubtriplicata
<
expan
abbr
="
ictuũ
">ictuum</
expan
>
, & ictus in ratione triplicata altitudinum defixarum,
<
lb
/>
quòd manifeſtum eſt ex Geometria; </
s
>
<
s
id
="
N28D07
">ſit enim conus BAF, qui defigatur
<
lb
/>
vno ictu; </
s
>
<
s
id
="
N28D0D
">ſitque alter ictus, quo defigatur tantùm FD ſubdupla FA: </
s
>
<
s
id
="
N28D11
">
<
lb
/>
cùm ictus ſint vt defixa ſolida; </
s
>
<
s
id
="
N28D16
">certè conus FD eſt ad conum FA in
<
lb
/>
ratione triplicata, id eſt vt cubus FD ad cubum FA, id eſt vt 1. ad 8.
<
lb
/>
quæ omnia conſtant: </
s
>
<
s
id
="
N28D1E
">idem dico de pyramide, quod de cono: hinc vi
<
lb
/>
detur differentia ictuum, quibus defigitur cuneus, & conus, </
s
>
</
p
>
<
p
id
="
N28D24
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type
="
main
">
<
s
id
="
N28D26
">Vigeſimotertiò, poteſt explicari quomodo deprimatur cylindrus con
<
lb
/>
ſtans ex molliori materia; </
s
>
<
s
id
="
N28D2C
">nam primò deprimitur prima ſuperficies
<
lb
/>
cylindri, & extenditur; quia cùm materia. </
s
>
<
s
id
="
N28D32
">ſit mollior, prematurque a
<
lb
/>
duobus corporibus duris vtrinque, ſcilicet ab vtraque baſi, cedit & di
<
lb
/>
latatur propter humorem in cauitatibus contentum. </
s
>
<
s
id
="
N28D39
">Secundò, aliquan
<
lb
/>
do totus cylindrus deprimitur ſeruatà ſemper cylindri licet craſſio
<
lb
/>
ris figurâ, quod vt fiat, molliſſimam materiam eſſe neceſſe eſt. </
s
>
<
s
id
="
N28D40
">Ter-</
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>
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