Barrow, Isaac, Lectiones opticae & geometricae : in quibus phaenomenon opticorum genuinae rationes investigantur, ac exponuntur: et generalia curvarum linearum symptomata declarantur

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UBi (_pag. 100_) de Centro gravitatis parabolæ & para-
boliformis verba fiunt, intelligantur non curvæ lineæ,
ſed iis comprehenſa ſpatia, de quibus apparet iſthic agi.
Sicubi ponitur {δ/π}, nec adponitur εκθεσις ulla, deſignan-
tur termini rationem exprimentes, quam habet circuli di-
ameter ad ejus circumferentiam.

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