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De lucis natura et proprietate (1662)

Vossius, Isaac, 1618-1689 · Amstelodami : Apud Ludovicum & Danielem Elzevirios · leaf 97

An illustration from De lucis natura et proprietate, 1662, leaf 97
i , necefla- rium quoque cft , ut ab eodem extremo folis ambitu exeant radii , qui ut in quodlibct aliud corpus , ita quo- que in caput comct«e impingant. Quia vero omnis lux terminata umbram poft fo facit , ncceflario fequitur ut inaveria cometjc parte fiat lucis diminutio, umbraque relinquatur,… … & progrediantur ufque in E , manifefte ab his termina- bitur conus umbrofus AEB, & ha:c quidem efl: angu- ftiffima umbra : latilfima vero terminabitur a radiis in- didem quidem ortis, fod decuflatis, quales font GB G & D A F. Hi formant & includunt umbram , five conum inverfum & apice truncatum…

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