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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ducantur ad curvam rectæ HN, HO; </
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<
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ore HO rectiùs incidet.</
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<
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<
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<
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<
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ipſam HM parallelæ. </
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<
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<
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<
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ang. </
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<
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<
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<
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</
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<
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<
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FOH &</
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<
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<
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<
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<
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nempe puncto H) iucidentium _obliquitatem_ creſcere, donec ad illam
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devenitur, quæ _curvam_ tangit, omnium obliquiſſima.</
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<
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cidens HM ſit omnium curvæ incidentium minima; </
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perpendicularis, ſeu tangenti MT.</
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<
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</
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HM. </
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<
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<
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_Hypotheſin_.</
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<
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erit HM curvæ perpendicularis.</
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<
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det. </
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cadet, eámq; </
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gò liquet.</
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<
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hæc _curvam_ tanget.</
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<
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par angulo TMH: </
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<
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nulla ſumi poteſt _maxima_, vel _minima._</
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<
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contra _Hypotbeſin_.</
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<
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<
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punctum quodpiam I; </
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