Barrow, Isaac
,
Lectiones opticae & geometricae : in quibus phaenomenon opticorum genuinae rationes investigantur, ac exponuntur: et generalia curvarum linearum symptomata declarantur
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Quia corpus bene terſum luci Splendidæ expoſitum albeſcit; </
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>
<
s
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xml:space
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niam alba difficiliùs ignem concipiunt; </
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<
s
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xml:space
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">Quòd humore tenuiore vacua-
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ta corpora (_Capilli, Polia, Cineres) canitiem_ acquirunt; </
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<
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xml:space
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">Quibus & </
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<
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<
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frigore conſtricta accenſeri poſſent.</
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<
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</
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<
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<
s
xml:id
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xml:space
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">_Nigrum_ eſt, quod lucem minimè, vel parciſimè refundit. </
s
>
<
s
xml:id
="
echoid-s5557
"
xml:space
="
preserve
">talia ple-
<
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runque ſunt corpora valdè pellucida; </
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>
<
s
xml:id
="
echoid-s5558
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xml:space
="
preserve
">nec non quæ crebros meatus,
<
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& </
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>
<
s
xml:id
="
echoid-s5559
"
xml:space
="
preserve
">cavernulas lucem abſorbentes habent. </
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>
<
s
xml:id
="
echoid-s5560
"
xml:space
="
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">Hoc indicat, Quod omnes
<
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_Umbrœ nigrœ apparent; </
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>
<
s
xml:id
="
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"
xml:space
="
preserve
">Quod Aqua, Vitrum, Nubes_ ad hunc colo-
<
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rem vergunt; </
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>
<
s
xml:id
="
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"
xml:space
="
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">Quod _nigra_ faciliùs ignem imbibunt, calefiunt, com-
<
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buruntur; </
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>
<
s
xml:id
="
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xml:space
="
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">Quòd longiùs diſſita (quorum ſenſim intercipitur, & </
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<
s
xml:id
="
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xml:space
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">amit-
<
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titur lux) obſcuriora videntur.</
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>
<
s
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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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">_Rubrum eſt_, quod lucem eſſundit hinc indè confertam, ac ſolito
<
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<
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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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">@ Lat.
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Fig. 128.</
note
>
magìs conſtipatam, aſt interſtitiis umbroſis diremptam, & </
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>
<
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="
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xml:space
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">interruptam.
<
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</
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<
s
xml:id
="
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xml:space
="
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">talia concipi poſſunt corpora, multas intra ſe quaſi _fornaculas & </
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<
s
xml:id
="
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xml:space
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">focos_
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habentia (qualia X, è _Speculis cavis_ contextum; </
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<
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xml:space
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">& </
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<
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xml:space
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">Y è _Sphœrulis_,
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tranſmiſſam lucem ad totidem _focas_ cogentibus, conſtans). </
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>
<
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xml:space
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mento ſit, Quòd à _Speculis, & </
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<
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xml:space
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">vitris uſtoriis_ collecta lux rubeſcit; </
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Quòd corpora denſa ignita (quippe quorum cellæ luce ſpiſsâ refer-
<
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ciuntur) rubra videntur; </
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>
<
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xml:space
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">Quòd roſcida nubes Soli (matutino, vel
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veſpertino) expoſita rubet; </
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<
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xml:space
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">Quòd eroſio rubiginem parit.</
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<
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xml:space
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">‖ Ad
<
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rubri naturam fortaſſe pertinet, quòd compreſſa lux languidiùs emicat.</
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</
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<
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xml:space
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">_Cœruleum_ eſt quod lucem raram, aut impetu ſegniore concitatam
<
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emittit. </
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<
s
xml:id
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xml:space
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">talia videntur eſſe corpora, quæ particulis conſtant albis ac
<
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atris alternatim diſpoſitis; </
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<
s
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<
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xml:space
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">hunc ſubinde colorem oſtentant can-
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dida maligniùs illuſtrata. </
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<
s
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xml:space
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">Exemplo ſint, _Æther Sudus_ (in quo
<
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nempe pauciora natant corpuſcula lucem ad oculos reverberantia, cæ-
<
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terâ luce dilabente) _Mare_, ſale candido nimirum & </
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<
s
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cido conſtans; </
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<
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">Umbra corporis cujuſvis opaci, de die, ad lucernam
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ardentem facta, & </
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<
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xml:space
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">(nempe
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corporis AB ad chartam XY violacea depingitur umbra, à lucerna C).</
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</
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<
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xml:space
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<
s
xml:id
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xml:space
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">_Diſcrimen_ explorent ſaga-
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<
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xlink:label
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xlink:href
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Fig. 128.</
note
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ciores; </
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<
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">ego non auſim ariolari.</
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</
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<
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<
s
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xml:space
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">Cæterùm reliqua colorata ex iſtis variè commixtis, atque contem-
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peratis emergunt; </
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<
s
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xml:space
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">ut _flavum_ ex albo copioſo, rubríque nonnihillo in-
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terſperſo; </
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<
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xml:space
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<
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">c. </
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<
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rùm ſuſficiat hâctenus, iſta ſupra captum noſtrum poſita Scrutantes;
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</
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<
s
xml:id
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xml:space
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">nos illis, quiàηιολογſicas pbyſicas moroſiùs excipiunt, deridendos pro-
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pinaſſe.</
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<
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</
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<
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<
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">Sufficient hæc pro radiis parallelis; </
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<
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xml:space
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dendum eſt; </
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<
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xml:space
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">aſt interpoſitâ morâ, nè vix exorſi cogamur abrumpere.</
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