Barrow, Isaac
,
Lectiones opticae & geometricae : in quibus phaenomenon opticorum genuinae rationes investigantur, ac exponuntur: et generalia curvarum linearum symptomata declarantur
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noſtro rem explicandi modo nihil durius obverſari video, quàm ut hinc
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divinæ potentiæ, ſapientiæque vis magìs eluceſcat, in luce ſic efforman-
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da, tam ejus effectricibus particulis admirabilem exilitatem, incom-
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prehenſibilemque velocitatem impertiendo, quæ prorſus ei neceſſariæ
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fuerunt, ut ſenſionem efficeret, & </
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nia obiret. </
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<
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xml:space
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pluſquam eâ fortaſſis proportione ſuperatur, quâ tota quanta quanta
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eſt mundana moles arenulam iſtam excedit; </
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xml:space
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bit abſonum, quiſquis ad complures ſatìs obvias apparentias men-
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tem adverterit.</
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<
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xml:space
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">Subnotandum eſt porrò duas has fundamentales hypotheſes, ſic ac-
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ceptas, innumeris adniodum familiaribus experimentis confirmari.
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quæcunque deſignabilis particula conſpicitur oculo, repræſentatur in
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ſpeculo, modò nihil objiciatur ab eo rectâ delabentes radios interclu-
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dens; </
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ſi quid opaci corporis directum intercipiens radiorum iter obtendatur. </
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Etiam foramen utcunque tantillum ſufficit trajiciendis radiis quibus tota
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quantivis objecti facies obverſa depingatur. </
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aut in partes directè contrarias (hoc eſt in ſe, vel in ſuam retro ſemi-
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tam) repellitur. </
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quoque conſentanea eſt; </
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unas potius quàm in alias partes deflectatur; </
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ſiverum ſit omne patiens, aut percuſſum vim inferenti poſitivâ quâdam
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vi repugnare, perſpicuum videtur eò reſiſtentiam dirigi, unde vis ingru-
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ebat; </
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