Barrow, Isaac
,
Lectiones opticae & geometricae : in quibus phaenomenon opticorum genuinae rationes investigantur, ac exponuntur: et generalia curvarum linearum symptomata declarantur
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<
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<
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xml:space
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tuti) imago perfectiſſima. </
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<
s
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xml:space
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">Siquidem imaginis vocabulo nil aliud in-
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telligo, quàm locum à quo plures radii (quot ſcilicet afficiendo viſui
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ſufficiunt) ſimiliter divergere, ſeu dimanare videntur, atque cùm à
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primariis objectis diffunduntur. </
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<
s
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xml:space
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objecti locus apparens, vel imago facilimè determinatur.</
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<
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<
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<
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xml:space
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<
s
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xml:space
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">Exhinc etiam eâdem operâ, viſùs imaginem adſpectantis axis,
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ſeu reflexus principalis (iſte nimirum qui per oculi centrum (puta O)
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tranſit,) & </
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<
s
xml:id
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">reflectionis (quod vocant) punctum determinantur. </
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<
s
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xml:space
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">Con-
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nexa nempe recta OZ@erit axis iſte; </
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<
s
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xml:space
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">nec non ejus cum EF interſectio
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N, punctum reflectionis.</
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<
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<
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xml:space
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tatiunculam. </
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<
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xml:space
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<
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">oculi centro O fixis manentibus
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recta Catoptrica EF ponatur rectæ cuidam OP parallela, ſed alioquin
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ſitu indeterminata; </
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<
s
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xml:space
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">erunt omnia reflectionis puncta in _Hyperbolæ_.
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</
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<
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xml:space
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<
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">biſecentur AP in X, at-
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que PO in Y; </
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<
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xml:space
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">& </
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<
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xml:space
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">per X ducatur XG ad PO parallela, item per Y
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<
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ducatur YH ad AP parallela; </
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<
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xml:space
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<
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Aſymptotis CG, CH per ipſum O deſcripta concipiatur _Hyperbole_
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ROS; </
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<
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<
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utcunque ducta EF ad PO parallela _Hyperbolæ_ ROS occurrat ad N;
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</
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xml:space
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<
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<
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æquari. </
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<
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xml:space
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xml:space
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<
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parallela. </
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<
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xml:space
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">Et, ex _Hyperbolæ_ natura, eſt CD. </
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quare dividendo erit YD. </
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CY :</
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rurſus ob CD. </
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<
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CY :</
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<
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permutando AB. </
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BN. </
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<
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<
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angulum ONQ angulo ANB æquari: </
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<
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adnotari; </
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de reflectionibus ad plana quicquam prætereà. </
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tranſeo.</
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