Barrow, Isaac
,
Lectiones opticae & geometricae : in quibus phaenomenon opticorum genuinae rationes investigantur, ac exponuntur: et generalia curvarum linearum symptomata declarantur
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viſibilibus obvenit) majus apparet. </
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<
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xml:space
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perficiem repræſentet, _(pupilli amplitudini reſpondentem)_ linea XY
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fundum oculi, A locum diſtinctæ viſionis; </
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<
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xml:space
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">ejuſmodi lucens ad A po-
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ſitum ſatìs anguſtum circa Z ſpatium illuſtrabit; </
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<
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xml:space
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">ad E verò conſtitu-
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tum, validè radios vibrans, totum coruſcatione ſuâ ſpatium OP
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afficiet; </
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<
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xml:space
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">ad F denique collocatum adhuc majus intervallum R S per-
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cellet, indéque grandiorem ſui ſpeciem exhibebit. </
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<
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xml:space
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">In placidè verò
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lucem remittentibus aliter ſe habet, quoniam pauciores, & </
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<
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diùs agentes qui extremis O, P vel R, Sallabuntur radii nullam ſui
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perceptionem excitant.</
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<
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<
s
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">Eo lubentius hanc, adeò perſpicuam, hujuſmodi _Phænomeγων_ aſſig-
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namus rationem, quoniam in eorum reddendis cauſis ità titubat magnus
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ille _Galilæus,_ neſcio quos, ex refractionibus, relectionibúsve quibuſdam
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commentitiis oriundos, aſcititios ſuggerens cincinnos.</
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<
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">Quin hic tandem _Dioptricam ſimplicens circularem claude_-
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_mus,_ quam utcunque quàm pauciſſimis ità complexi ſumus, ut præ-
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cipua ſaltem (quæ videbantur) & </
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<
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</
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<
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">priùs autem _Catoptricam cir cularem_; </
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_optricam_ quàm _Catoptricam,_ planam, quantum inſtituto noſtro viſum
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eſt congruere, pertractavimus. </
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<
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xml:space
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">quibus perfuncto mihi propoſitum
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aliquando fuit ad curvas alias, conicas præſertim ſectiones, haud diſſi-
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mili methodo pertentandas cogitationem extendere. </
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in his tricis _Geometricis_ etiamnum ſatìs ſupérque commoratus ſim; </
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& </
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(quæ & </
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">ab aliis luculentè tractata proſtant) reliqua non ità magnum
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uſum ſpondeant; </
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& </
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<
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">uſui præſertim accommodatas ſuperficies, ultra paullò quàm hacte-
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nùs attentatum aut peractum ſcirem, excuſſiſſe; </
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<
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miſſas faciam.</
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<
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planis, aut Sphæricis Superficiebus, utcunque conſtitutis aut compoſitis,
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incidentes ſubeunt radii; </
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<
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">quæ conveniunt illis Symptomata, poſſunt ea
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de præmiſſis elici; </
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puncti locum reſpicit ab inflectionibus ad iſtas ſuperficies factis reſul-
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tantem; </
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diſquiſitiones verſantur; </
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idque ſatìs commodè, ex uno quodam Theoremate, ſeu regula gene-
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rali; </
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<
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">cui exempla quædam, communis usûs in gratiam ſelecta, eorúm-
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que qui in hæc inciderit minuendo labori præſertim comparata, ſubjun-
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gemus. </
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