Barrow, Isaac
,
Lectiones opticae & geometricae : in quibus phaenomenon opticorum genuinae rationes investigantur, ac exponuntur: et generalia curvarum linearum symptomata declarantur
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<
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<
s
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xml:space
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">I. </
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<
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xml:space
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">_CAtoptricâ circulari defunctus ad Dioptricam promovemur;_
<
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</
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<
s
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xml:space
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">quorſum incidentium quotcunque refractis unâ ſimulo perâ
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delineandis, adeóque reſractionum ſymptomatis organicè pertentan-
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dis modum imprimìs exponemus, præ cæteris, opinor expeditum. </
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<
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<
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Seorſim ad v γ æqualem diametro (NG) circuli refringentis deſcri-
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batur circulus v π γ. </
s
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<
s
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xml:space
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">item habeat v γ ad S γ rationem illam, quæ re-
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fractiones determinat (illam autem deinceps, ut antehac, conſtanter
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nuncupabo rationem I ad R) & </
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<
s
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xml:space
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">ſuper diametro S γ deſcribatur quo-
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que circulus SH γ. </
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<
s
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xml:space
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">Incidat jam radius quilibet MN P, cui con-
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<
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xlink:href
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xml:space
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">Fig. 107.
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108.</
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veniens deſignandus eſt refractus. </
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<
s
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xml:space
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">ut hoc aſlequamur, circulo adpoſi-
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to à V adaptetur v π = NP; </
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<
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xml:space
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">& </
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<
s
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xml:space
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">centro γ per π deſcriptus circulus
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ſecet circulum SH γ in H; </
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<
s
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xml:space
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">connexáque γ Hcirculum v π γ interſecet
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in ξ. </
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<
s
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xml:space
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">demùm connexâ v ξ, circulo NPGaccommodetur NX =
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v ξ; </
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<
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xml:space
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">erit NX ipſius NP refractus. </
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<
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xml:space
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">Etenim (ductis GP, GX) eſt
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γ H. </
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<
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<
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">hoc eſt γ π. </
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GP. </
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<
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<
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">cùm itaque ſint ipſæ GP, GX recti ſinus angulo-
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rum GN π, GNX(quorum GNPeſt angulus incidentiæ) liquet
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propoſitum.</
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<
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">Ad ipſa _Symptomata_ progrediamur exponenda radiis ad circu-
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lum refractis competentia; </
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<
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<
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">Fig. 109.</
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mus, quæ radianti puncto conveniunt ad infinitam quaſi diſtantiam
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poſito, ſeu parallelos ad ſenſum radios ejaculanti. </
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circuli refringentis Centrum C punctúmque de longinquo radians
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protendatur recta AC Z; </
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<
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<
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<
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vidatur CZ in F, ut ſit FZ. </
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<
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">centro F per Z deſcri-
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batur circulus EG Z. </
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<
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">his peractis, accipiatur jam quilibet ad AC
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parallelus MNP(convexis incidens an concavis partibus perinde
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fuerit) dico ſi recta NC (ab incidentiæ nempe puncto per refrin-
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gentis centrum ducta) circulo EGZprotracta occurrat in G; </
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