Barrow, Isaac
,
Lectiones opticae & geometricae : in quibus phaenomenon opticorum genuinae rationes investigantur, ac exponuntur: et generalia curvarum linearum symptomata declarantur
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CB exiſtet; </
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AE = AN; </
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<
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xml:space
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">concurſus infinitè diſtabit; </
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<
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N π parallelus erit.</
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<
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<
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AN = √{AQ q/3}. </
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<
s
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xml:space
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">Nam AQ q = AP x AN = 3 AN x AN = 3 AN x AN
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= 3 ANq; </
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<
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">itaque punctum N, iſtos caſus diſterminans, facilè de-
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ſignatur.</
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">Rationem ipſi tantillùm attendentes perſpicietis; </
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<
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evolvendo minutias non animi ſatìs, non otii ſuppetit.</
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obſervatiunculam attexere. </
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">Si fuerit Z radiantis A lmago, viciſſim erit
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A radiantis Z lmago. </
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<
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">è dictis quoad ſpeciales caſus facilè cernitur
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hoc conſectari. </
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<
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<
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">hinc generatim verum apparebit ſatìs: </
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rit Z ipſius A imago, tantum unus idcircò ab A manantium inflexus
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per Z tranſibit. </
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">(hoc imagini proprium eſſe ſæpiùs in decurſu in-
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culcata ſatìs arguunt, ſuperque) quare reciprocè ſolus unus ab Z
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manantium inflexus per A tranlibit (nam ſi duo tales per A tranſire
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dicantur, etiam indè duo per Z tranſibunt, contra hypotheſin) erit
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igitur A ipſius Z imago. </
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& </
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">caſus inter ſe varios conferentibus affundens lucem) obſervatio gene-
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ralibus intertexi; </
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quædam in abſtractione ſumma non ità facilè vèl explicari poſſunt,
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vel comprobari.</
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<
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nus promoviſſe, haud diſparia (certè magìs nova, miniméque pro-
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trita) circa refractiones ſphæricas, ſeu circulares, attentabo.</
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