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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_culi peripberiam ſubeunt radii ſibimet paralleli; </
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_venit proximè diſpicien ſxm venit, qui a puncto qu@piam ſenſibiliter_
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_diver gentes itidem circulo ſe objiciunt refringendos._ </
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<
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Hypotheſi multa reperiatur caſuum varietus è pluribus cauſis oriunda
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(nedum enim à mediorum ſpecie differentium ordine, vel ſitu verſus
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ſe diverſo; </
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<
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">quinetiam circuli refringentis alia ac alia, convexa nem-
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pe vel concava, facie radiationi obverſa; </
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<
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antis magìs aut minùs à refringente ſemoti poſitione concluſionum
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emergit nonnulla diſcrepantia) nobis incumbet ità rem, quâ poſſu-
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mus, moderari, ſimul ut cùm ex abſtractione nimia proveniens con-
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fuſio, tum è repetitione faſtidium aliquouſque devitentur. </
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<
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non aliàs, opinor, commodiùs aſſequemur quàm imprimìs generalia
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quædam attingendo, cuidam uni caſui (illi nempe, ubi I &</
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radii convexis circuli partibus incidunt). </
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lè poſſint ad alios quoque transferri; </
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congruentia ſubnotando. </
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<
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ctum A; </
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conveniens; </
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æquari rationi I ad R. </
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CN parallela; </
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I. </
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AC. </
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