Barrow, Isaac
,
Lectiones opticae & geometricae : in quibus phaenomenon opticorum genuinae rationes investigantur, ac exponuntur: et generalia curvarum linearum symptomata declarantur
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provcniant infinitè diſſito) circa radios parallelos obſervatiunculam,
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compendio ſervientem, etiam hîc tempeſtivum fuerit adjungere; </
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<
s
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echoid-s2003
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rallelorum nempe Convexis incidentium partibus radiorum inflexi,
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quoad poſitionis directionem, iidem erunt cum inflexis ipſorum con-
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cavis partibus incidentium; </
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<
s
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echoid-s2004
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xml:space
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">modò tranſpoſita concipiantur media.
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</
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<
s
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echoid-s2005
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xml:space
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preserve
">Quare parallelorum radiationes examinando nihil erit opus convexas
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partes à concavis diſtinguere; </
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<
s
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echoid-s2006
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xml:space
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">ſeu exinde caſus multiplicare. </
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<
s
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echoid-s2007
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xml:space
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">Res è
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poſthac dicendis clarior evadet. </
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<
s
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echoid-s2008
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xml:space
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">His admonitis, de tabula jam manum ; </
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& </
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<
s
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echoid-s2010
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xml:space
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">quam propoſuimus inſtituendam proximè diſquiſitionem ſequenti
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reſervamus.</
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<
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V.</
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<
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<
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">EO jam provecti ſumus, ut radiantis (à ſenſibiliter finita diſtan-
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tia) puncti locum apparentem inveſtigemus, illum nempe qui
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reſultat, è peracta ad planam ſuperficiem refractione; </
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<
s
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echoid-s2014
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xml:space
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">nec non reſpe-
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ctu viſus extra radiationis axem conſtituti. </
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<
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echoid-s2015
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xml:space
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">Quorſum imprimis ſpectat,
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ut rectam determinemus lineam, in qua locus ille verſatur; </
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<
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xml:space
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">tum ut
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ſingulare deſignemus in illa recta punctum, circa quod exquiſitè con-
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ſiſtit. </
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<
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xml:space
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">Utriuſque quæſiti gratiâ conficiendum, (imo penitius excutien-
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endum) venit hujuſmodi _Problema_:</
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<
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">_II_. </
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">Dato puncto A, in poſitione datam rectam EF radiante, deſig-
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nandus eſt incidens, qui per alterum tranſeat datum punctum.</
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<
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xml:space
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">III. </
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<
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ad refringentem EF perpendiculari Problema planum erit, ac ità faci-
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lè conficietur. </
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<
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xml:space
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<
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:</
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<
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<
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<
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<
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tro Y intervallo T deſcriptus circulus ipſam EF ſecet in N ; </
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<
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ctantunrque AN, KN; </
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<
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<
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Iq. </
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<
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<
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<
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batur circulus ipſi EF occurrens in N ; </
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