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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<
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xml:space
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">Radii lucis (hoc eſt lucidi tranſitûs aut impulſùs quales de-
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ſcripſimus tramites) in eodem exiſtentes ſimilari medio directi ſunt.
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<
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xml:space
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">Hoc è dictis abunde patet. </
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<
s
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xml:space
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">Quin indè Corollarii vice deducitur radios
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quoad rem ipſam, Phyſicéque loquendo figurà priſmaticos eſſe, vel
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cylindricos. </
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<
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">Nempe corpuſculum illud quodpiam in lucidi ſuperficie
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poſitum, à quo radius originem ſuam ducit, dum à primò ſuo loco ceu
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baſe defertur aut totâ ſuâ ſuperficie contiguum ſibi corpus rectà propel-
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lit, figuræ ſuæ (vel impulſi ſaltem corporis figuræ) congruum deſig-
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nat, ſuper hac vel illa baſe conſtitutum, ſolidum longum, exile, teres,
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quale cylindrus, aut priſma. </
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<
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xml:space
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">Proinde quando Mathematicè rem tra-
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ctamus, iſtos radios pro rectis lineis habere poſſumus; </
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<
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xml:space
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">tum quia reve-
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ra ſunt adeo tenues & </
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<
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">recti; </
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<
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">tum quia plerumque pro cylindricis ejuſ-
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modi ſeu priſmaticis figuris ipſarum axes ità ſumi poſſunt, ut nihil indè
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ratiocinio Mathematico derogetur.</
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<
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medii (non obſtaculis interciſi) punctum lucis aliquis radius dirigitur.
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</
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<
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">Hæc apud Opticos tritiſſima ſuppoſitio quò vel intelligi vel admitti
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poſſit, omninò duplicem limitationem exigere videtur, è ſupra dictis
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utramque deducibilem. </
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<
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">Unam, ut omnis puncti nomine nedum non
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præciſè punctum quodcunque Mathematicum, ac nec omnem particu-
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lam concipiamus realem & </
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<
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<
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guam, qualíque ferme minorem vel animo deſignare nequeamus; </
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<
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teram ut non in unoquoque ſtrictè dicto temporis inſtanti, nec in omni
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reali temporis portiuncula cogitemus hoc contingere, ſed ut nullum
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temporis intervallum ſentiri poſſit ità curtum, aut momentaneum, quin
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intra ipſum à quavis lucidi deſignabili parte deſignatam ad medii partem
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radius aliquis exporrigatur. </
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<
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ſignavimus radices, lucidum componentia corpuſcula, ſint illorum,
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quorum nos utcunque quantitates ſenſu vel animo pertingere valemus,
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corporum reſpectu tanquam infinitè parva, nec non infinità quaſi per-
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nicitate donata, non difficilè concipi poteſt in omni deſignabili, vel
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imaginabili lucentis ſpatiolo prorſus innumerabilem eorum multitudi-
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tudinem exiſtere, quorum fere ſingula diverſas in plagas tendunt; </
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<
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nulla ſit deſignabilis plaga, quam non una quæpiam appetat, aliquam
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ſaltem, utlibèt imperceptibilis & </
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<
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nendo. </
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<
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ſucceſſivè talia corpuſcula ſubingrediuntur juxta deſerúntque, de qui-
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bus mirum fuerit ni quoddam unum ad deſignatum medii ſpatium ten-
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dat, ſibi tranſmittendo meatuum aliquem (quos & </
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<
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