Newton, Isaac
,
Philosophia naturalis principia mathematica
,
1713
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LIBER
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PRIMUS.</
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Scholium.
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>Harum attractionum haud multum diſſimiles ſunt Lucis reflexi
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ones & refractiones, factæ ſecundum datam Secantium rationem, ut
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invenit
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Snellius,
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& per conſequens ſecundum datam Sinuum ratio
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nem, ut expoſuit
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Carteſius.
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Namque Lucem ſucceſſive propagari
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& ſpatio quaſi ſeptem vel octo minutorum primorum a Sole ad
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Terram venire, jam conſtat per Phænomena Satellitum
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Jovis,
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Ob
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ſervationibus diverſorum Aſtronomorum confirmata. </
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>Radii autem
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in aere exiſtentes (uti dudum
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Grimaldus,
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luce per foramen in te
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nebroſum cubiculum admiſſa, invenit, & ipſe quoque expertus
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ſum) in tranſitu ſuo prope corporum vel opaeorum vel perſpicuo
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rum angulos (quales ſunt nummorum ex auro, argento & ære cu
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ſorum termini rectanguli circulares, & cultrorum, lapidum aut fra
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ctorum vitrorum acies) incurvantur circum corpora, quaſi attracti
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in eadem; & ex his radiis, qui in tranſitu illo propius accedunt
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ad corpora incurvantur magis, qua
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ſi magis attracti, ut ipſe etiam dili
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genter obſervavi. </
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>In figura deſig
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nat
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aciem cultri vel cunei cujuſvis
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AsB
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; &
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gowog, fnunf, emtme,
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dlsld,
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ſunt radii, arcubus
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owo,
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nun, mtm, lsl
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verſus cultrum
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incurvati; idque magis vel mi
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nus pro diſtantia eorum a cultro. </
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Cum autem talis incurvatio radio
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rum fiat in aere extra cultrum, de
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bebunt etiam radii, qui incidunt in cultrum, prius incurvari in aere
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quam cultrum attingunt. </
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>Et par eſt ratio incidentium in vitrum. </
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Fit igitur refractio, non in puncto incidentiæ, ſed paulatim per
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continuam incurvationem radiorum, factam partim in aere ante
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quam attingunt vitrum, partim (ni fallor) in vitro, poſtquam illud
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ingreſſi ſunt: uti in radiis
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ckzkc, biyib, ahxha
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incidentibus ad
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r, q, p,
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& inter
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k
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&
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z, i
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&
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y, h
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&
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x
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incurvatis, delineatum eſt. </
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Igitur ob analogiam quæ eſt inter propagationem radiorum lucis
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& progreſſum corporum, viſum eſt Propoſitiones ſequentes in uſus
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Opticos ſubjungere; interea de natura radiorum (utrum ſint cor
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pora necne) nihil omnino diſputans, ſed Trajectorias corporum
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Trajectoriis radiorum perſimiles ſolummodo determinans. </
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