Barrow, Isaac
,
Lectiones opticae & geometricae : in quibus phaenomenon opticorum genuinae rationes investigantur, ac exponuntur: et generalia curvarum linearum symptomata declarantur
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buit, ſolertia quadantenus eluceſcere videatur, ſeu ratio quædam aſſig-
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nari poſſit, cur oculi fundus _Sphær@idicam_ (aut ab hac non multum
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abludentem) nacta ſit ſiguram. </
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<
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xml:space
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rum modicè diſtantium (quibus in diſtinctiùs apprehendendis po-
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tiſſimus verſatur uſus) excipiendis ſimulachris eſt accommodatiſſima.
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</
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<
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xml:space
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<
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xml:space
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<
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ideò tacitus præterlabi poſſem; </
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<
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xml:space
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clariùs & </
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<
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oculos ponere: </
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<
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<
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">Rarioris medii circulo MBN objiciatur recta FAG, cui normalis
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CA; </
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abſoluta; </
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tracta ad H; </
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- FC x CM. </
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xml:space
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- CR x FC x CM = CA x FC x CZ - CA x CM x CZ = CA x FC x CZ - FC x CM x CX. </
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CR x CM = CA x CZ - CM x CX. </
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CZ - CA x CZ = CR x CM - CX x CM; </
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<
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tam (vel ad oculum in centro C ſitum relatam) ſi RC &</
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_lipticam_ fore; </
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num pars anterior ETE ad convexam circuli refringentis partem
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MBN pertinet, poſterior YEEY ad cavam LDL). </
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fuerit RC &</
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<
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YTY pars ſuperior ETE ad circuli partem NBN referenda eſt;
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concavas LDL pertinebit. </
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CE, tota hyperbola ζ V ζ interceptam punctis K rectæ FG portio-
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nem referet, ejúſque quod hinc indè protenſum ſupereſt ab ipſa YEEY
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repræſentabitur.</
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ſectionem eandem conicam innumeris rectis lineis ad diverſos </
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