Barrow, Isaac
,
Lectiones opticae & geometricae : in quibus phaenomenon opticorum genuinae rationes investigantur, ac exponuntur: et generalia curvarum linearum symptomata declarantur
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cedentia; </
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<
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">nec non ità perpetuâ deinceps ad nos deductâ ſerie; </
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<
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ſim certè mihi dijudicandum accipere; </
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<
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xml:space
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gumentis niti videtur, æquis utraque difficultatibus urgeri. </
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<
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xml:space
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fere propendeo, ut cenſeam utroque ſubinde modo lucem procreari,
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tam per effluvia corporea, quàm per continuum impulſum; </
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<
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fore nonnullos ejus effectus huic, alios illi tribuere. </
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<
s
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xml:space
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">Sanè cùm ad
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quantum intervallum undiquaque protenſum exiguæ lampadis flam-
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mula ſe vividè conſpiciendam præbeat, adeò quidem ut integrum ejus
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radiatione circumpolitum medium perfundi compleríque videatur,
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animadverto; </
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<
s
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xml:space
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">quomodo tantillum corpus tali tamdiu ſuppeditandæ
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profluviorum copiæ par ſit; </
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>
<
s
xml:id
="
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xml:space
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">quomodo dum ea profundit non ipſum
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pluſquam exhauriatur, & </
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>
<
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">confeſtim evaneſcat, haud facile capio.
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</
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<
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xml:space
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">Cum verò rurſus lucis inflectiones, illáſque qui conſequuntur effectus
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cogito, vix animo meo nudus impulſus facit ſatis. </
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<
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xml:space
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us hæreo. </
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">Veruntamen quia de natura lucis aliquid præſternam expe-
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dit, iis quas mox tradam hypotheſibus nonnihil explicandis congruum; </
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hoc ſe modo, vel non abſimili rem habere concipio.</
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<
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">Pono corpus omne lucidum, ut tale, congeriem eſſe quandam
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corpuſculorum ultrà pene quàm cogitari poteſt minutorum & </
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</
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">horum autem unumquodque vehementiſſimo motu percitum, aliquò
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(ſecundum legem iſtam naturæ ſatìs receptam & </
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">exploratam) rectà
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tendere; </
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partes nullo colligatæ nexu quaquaverſùm liberè feruntur) è corpori-
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bus aggregatum, exiliſſimis quidem & </
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craſſis & </
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oribus illis admittendis opportuna; </
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culorum occurſu progreſſum impediri multorum ex illis, quæ in lucidi
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ſuperficie verſantur, aut ab ea ruunt corpuſculis; </
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xml:space
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inhibitis, atque repulſis introrſum ſe recipere, quo fit ut dicta conge-
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ries (aliis etiam in eam aliunde confluentibus ejuſdem naturæ corpuſcu-
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lis) aliquatenus intra ſuos cancellos reſtringatur, nec toto ſtatim in au-
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ras expanſa diſſipetur. </
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pertâ viâ curſum ſuum rectà continuare, materiam inibi deprehenſam
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haud ita foniter obſiſtentem in fugam agentia, & </
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quorum veſtigiis alia de lucido corpore ſimiliter prodeuntia prorſus
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inſiſtent, longúmque ſimul omnia lucis rivulum efficient, indeflexâ
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ſerie procurrentem. </
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dii craſſiores particulas impetu ferire tam prævalido, nonnunquam ut
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ipſas quoque cedere cogant, & </
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