Barrow, Isaac
,
Lectiones opticae & geometricae : in quibus phaenomenon opticorum genuinae rationes investigantur, ac exponuntur: et generalia curvarum linearum symptomata declarantur
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autem procedentis cujuſvis radii (ceu AN) refractus N _a_ cum ipſa AB
<
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<
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note-0050-01
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xml:space
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">_lect. 3. num. 9_.</
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(protractus utique, vel retractus) conve@iat in K; </
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<
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</
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<
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<
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<
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xml:space
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<
s
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xml:space
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">(Neque non inverſè, ſi fuerit NK. </
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<
s
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<
s
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<
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erit KN _a_ ipſius NA refractus.)</
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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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">Hoc è ſuperiùs oſtenſis immediatè conſectatur. </
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<
s
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xml:space
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preserve
">Et hinc etiam ſatis
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apparet, quoniam (id quod bene notetur, ut paſſim in ſequentibus aſ-
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ſumendum) angulus NAB, æ quatur angulo incidentiæ (quippe cum
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is complementum ſit anguli ANB;) </
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<
s
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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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">angulus NKB (comple-
<
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mentum videlicet anguli KNB) æquatur angulo refracto. </
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<
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xml:space
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">Cùm ita-
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que ſit hinc ſinus anguli NAB (vel anguli deinceps NAK) ad ſi-
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<
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xml:space
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">Fig. 34, 35.</
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num anguli NKA, ut I ad R; </
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<
s
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xml:space
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">etiam in triangulo NAK latus NK ad
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latus NA ſeſe habebit ut I ad R. </
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<
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">Quod E. </
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<
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<
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xml:space
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">Quinetiam ſi latera
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NK, NA ſe habeant ut I ad R; </
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<
s
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xml:space
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">etiam dictorum angulorum ſinus ità
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ſe habebunt; </
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<
s
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xml:space
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">unde conſtabit ipſam KN _a_ ad AN pertinere.</
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<
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<
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xml:space
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xml:space
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">Hinc particularis emergit expeditiſſimus modus hujuſmodi quot-
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cunque refractos deſignandi. </
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<
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xml:space
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AB refringenti EF perpendicularis; </
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<
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<
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<
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per Z ducatur recta GH ad EF parallela, Proponatur jam quilibet
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incidens AN, cui conveniens deſignandus eſt refractus. </
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<
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xml:space
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deſignaveris. </
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<
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xml:space
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">Protrahatur NA (ſi opus) ut cum GH conveniat in
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S; </
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<
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xml:space
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">centro N per S deſcribatur circulus ipſam AB ſecans in K (ſe-
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cabit utique ſi refractus aliquis ad incidentem AN pertineat) erit con-
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nexa KN, protractáque radio AN debitus refractus. </
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<
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KN. </
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<
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liquet (è præcedente) propoſitum.</
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<
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">Exhinc etiam hujuſmodi refractionis præcipua ſymptomata
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perfacili colliguntur Negotio; </
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<
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<
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cum mutuò collatis accidunt refractis; </
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<
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(quum nempe refractio fit è rariori in denſius, ſeu quum I&</
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<
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concurſus refractorum cum recta AB (quam ſubinde radiationis hujus
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axem appellare licebit) ſupra punctum Z exiſtit. </
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<
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</
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NZ; </
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contrariè ſe habent) dictus concurſus infra punctum Z exiſtit. </
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nim rurſus connexâ NZ; </
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<
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jor, adeóque NZ &</
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<
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<
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<
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<
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<
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ſpectivè) omnes refracti cum axe AB concurrunt. </
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<
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