Huygens, Christiaan
,
Christiani Hugenii opera varia; Bd. 2: Opera geometrica. Opera astronomica. Varia de optica
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CHRISTIANI HUGENII
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<
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">Problema</
emph
>
IV.
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>
. XX.</
head
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<
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it
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<
s
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echoid-s1893
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xml:space
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">CIrcumferentiæ ad diametrum rationem inve-
<
lb
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ſtigare; </
s
>
<
s
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echoid-s1894
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xml:space
="
preserve
">& </
s
>
<
s
xml:id
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echoid-s1895
"
xml:space
="
preserve
">ex datis inſcriptis in dato circulo
<
lb
/>
invenire longitudinem arcuum quibus illæ ſubtendun-
<
lb
/>
tur.</
s
>
<
s
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xml:space
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"/>
</
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<
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<
s
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"
xml:space
="
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">Eſto circulus centro D, cujus diameter C B, & </
s
>
<
s
xml:id
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echoid-s1898
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xml:space
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">ſit arcus
<
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<
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xlink:label
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xlink:href
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xml:space
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">TAB. XL.
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Fig. 6.</
note
>
B A ſextans circumferentiæ, cui ſubtenſa ducatur A B,
<
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itemque ſinus A M. </
s
>
<
s
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xml:space
="
preserve
">Poſitâ igitur D B ſemidiametro par-
<
lb
/>
tium 100000, totidem quoque erit ſubtenſa B A. </
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>
<
s
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="
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xml:space
="
preserve
">A M ve-
<
lb
/>
rò partium 86603 non unâ minus, hoc eſt, ſi una pars ſi-
<
lb
/>
ve unitas auferatur ab 86603 fiet minor debito. </
s
>
<
s
xml:id
="
echoid-s1901
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xml:space
="
preserve
">quippe ſe-
<
lb
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miſſis lateris trianguli æquilateri circulo inſcripti.</
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<
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xml:space
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</
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<
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<
s
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xml:space
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">Hinc exceſſus A B ſupra A M fit 13397 vero minor.
<
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</
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<
s
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xml:space
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">Cujus triens 4465 {2/3} additus ipſi A B 100000, fiunt partes
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104465 {2/3} minores arcu A B. </
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>
<
s
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xml:space
="
preserve
">Et hic primus eſt minor termi-
<
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nus, quo poſtea alium vero propiorem inveniemus. </
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>
<
s
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xml:space
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">Prius
<
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autem major quoque terminus ſecundum Theorema præce-
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dens inquirendus eſt.</
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<
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</
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<
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<
s
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xml:space
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">Tres nimirum ſunt numeri quibus quartum proportiona-
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lem invenire oportet. </
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<
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xml:space
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">Primus eſt partium duplæ A B & </
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>
<
s
xml:id
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xml:space
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">tri-
<
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plæ A M qui erit 459807, vero minor, (nam hoc quoque
<
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/>
obſervandum ut minor ſit, idemque in cæteris prout dicetur)
<
lb
/>
ſecundus quadruplæ A B & </
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>
<
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xml:space
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">ſimplæ A M qui 486603 vero
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maj. </
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>
<
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xml:space
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">Et tertius triens exceſſus A B ſupra A M, 4466 vero
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major. </
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>
<
s
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xml:space
="
preserve
">Itaque quartus proportionalis erit 4727 vero maj.
<
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</
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>
<
s
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xml:space
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">quo addito ad A B 100000 fit 104727, major numero par-
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tium, quas continet arcus A B, peripheriæ ſextans. </
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>
<
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xml:space
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<
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symbol
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position
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xlink:label
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xml:space
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">per præced.</
note
>
igitur invenimus longitudinem arcus A B ſecundum mino-
<
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rem majoremque terminum, quorum hic quidem longe pro-
<
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/>
pior vero eſt, cum vero proximus ſit 104719.</
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<
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xml:space
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">Sed ex utroque iſtorum alius minor terminus habebi-
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/>
tur priore accuratior ſi@ utamur præcepto ſequenti, quod
<
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/>
à diligentiori centrorum gravitatis inſpectione dependet.</
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