Barrow, Isaac
,
Lectiones opticae & geometricae : in quibus phaenomenon opticorum genuinae rationes investigantur, ac exponuntur: et generalia curvarum linearum symptomata declarantur
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ſeu quicquid retractio ad E effecit, id refractio ad K retexit, radium in
<
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ſtatum reſtituens, ei quem ab origine habuit non diſparem. </
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<
s
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xml:space
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">Verùm
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hæc non eſt hujus loci penitiùs excutere, Saltem obſervari meretur hoc
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præcipuum, ut arbitror, in priſmate Phænomenon.</
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<
s
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xml:space
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">VIII. </
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<
s
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xml:space
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">Hæc, inquam, cùm ab experientia confirmentur, neque tamen
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ei magis, quam ratiociniis noſtris conſentiant, cauſis tamen adſcribun-
<
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tur (à quibuſdam) nedum diverſis, at prorſus adverſis. </
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>
<
s
xml:id
="
echoid-s731
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xml:space
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">Quòd enim
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vitrum _e. </
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<
s
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xml:space
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">g_. </
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<
s
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="
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xml:space
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">radios intra corpus ſuum receptos, ejúſque poſticæ ſuper-
<
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ficiei obliquius incidentes retrocedere cogat, hujuſmodi rationem exhi-
<
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bent: </
s
>
<
s
xml:id
="
echoid-s734
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xml:space
="
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">aiunt vitrum radios faciliùs admittere, vel tranſmittere quàm
<
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aërem; </
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>
<
s
xml:id
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xml:space
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">quin addunt aërem vi reflectendi prævalidâ pollere; </
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>
<
s
xml:id
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xml:space
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">quódque
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proinde qui poſt vitrum adventanti radio fit obvius aër cum reverbe-
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rat. </
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>
<
s
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xml:space
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">Quæ ratio mihi non adblanditur. </
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>
<
s
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echoid-s738
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xml:space
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">Nam imprimis rei naturæ mi-
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nùs conſentanea videtur. </
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<
s
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xml:space
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">Quum enim aëris corpus ex æthere puro
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maximam partem, è corpuſculis terrenis, & </
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<
s
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">ex halitibus aqueis con-
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ſtare totum videatur; </
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<
s
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xml:space
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">ex his partibus æther, opinor, non minùs
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promptè quàm vitrum radios tranſmitti; </
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<
s
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xml:space
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">aqua vero ſaltem (ex illo-
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rum, quibuſcum diſputamus, ſententiâ) tantillo difficiliùs; </
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<
s
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xml:space
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">adeóque
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neutiquam harum alterutri dicta reflectio jure videtur attribuenda;
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</
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<
s
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xml:space
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">terreſtres autem particulæ (quæ præ reliquis etiam pauciores videntur,
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& </
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<
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">rariùs interſperſæ, præſertim in aëre ſudo ſummíſque; </
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<
s
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xml:space
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">montium ex-
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celſorum jugis) ſunt opacæ, nec lucem admittunt, aſt eam in omni-
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cunque pariter incidentiâ rejiciunt; </
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<
s
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xml:space
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">adeò ut nec ad has quam reſpici-
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mus lucis inflectio propriè ſpectet; </
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<
s
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xml:space
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">ergò nihil ſubeſſe videtur cauſæ, cur
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aër (præ vitro) ingruenti luci potentiùs obſiſtat. </
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<
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">Addo; </
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<
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">ſi talis aëri vis
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reflexiva competat, & </
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<
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xml:space
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">vera ſit, quam hi Philoſophi memorato Phæ-
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nomeno cauſam adſignant, conſequi videtur, ut nulla prope Horizon-
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tem Stella conſpici poſſit (admiſſo ſaltem hoc, non inverecundo reor,
<
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ut pleriſque viſum erit, poftulato; </
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<
s
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xml:space
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">quòd purus Æther, naturale lucis
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vehiculum, aëreæ regioni ſuprajectus haud mînùs facile quàm vitrum
<
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aut aqua radios intromittet.) </
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<
s
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xml:space
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">Sit enim C terræ centrum, O oculus,
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S viſibile punctum longinquum, ceu ſtella, ſitum in Horizonte; </
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">Fig. 14.</
note
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puncta verò C, O, S trajectum concipiatur planum faciens in terræ ſu-
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perficie circùlum OP; </
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<
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">in atmoſphæræ, vel aëris circumfuſi, extima
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ſuperficie circumferentiam ZNM; </
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<
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">itaque cum radius quilibet, ut
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SM, vel SN (Horizontalis puta, vel eò ſuperior) in ſuperficiem MZ
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cadens ei incidat perquam obliquè (niſi ſaltem atmoſphæræ Semidi-
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ameter CZ præ telluris Semidiametro CO dicatur enormiter, & </
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<
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credibiliter magna) cùm & </
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<
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