Barrow, Isaac
,
Lectiones opticae & geometricae : in quibus phaenomenon opticorum genuinae rationes investigantur, ac exponuntur: et generalia curvarum linearum symptomata declarantur
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<
s
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xml:space
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">Huic effato ſi contraria obtendatur experientia, monſtrans ſubinde
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duntaxat unam imaginem apparere; </
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<
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">regero, in refractione quidem
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ad ſuperficiem planam apparenter hoc plerumque contingere, quo-
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niam imagines iſtæ duæ (quales α, _a_) ita ſibimet ipſis, ita refracto-
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rum concurſui X vicinæ ſunt, ut ipſarum intervallum diſcerni nequeat,
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ipſæque (ſicut in ſimili caſu obvenire mox oſtendemus) velut in unam
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imaginem interceptibilitèr coaleſcant; </
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<
s
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xml:space
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">aſt in aliis diverſi generis in-
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flectionibus, etiam ſenſu conteſtante, maniſeſtè ſecùs apparet; </
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<
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quod cùm è compluribus admodum obviis experimentis conſtare poſſit,
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unum ſaltem ac alterum proponemns. </
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<
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xml:space
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">Speculo BNM exponatur ob-
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">Fig. 177,
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178.</
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jectum A; </
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<
s
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xml:space
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">tum oculis, velut ad O, P conſtitutis, apparebit ejuſce
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duplex ſpecies α, _a_; </
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<
s
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xml:space
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">quarum illa (a) clauſo oculo O, hæc (_a_) clauſo
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P diſparebit.</
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<
s
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xml:space
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">Notetur autem, ſi placet, imaginum α, _a_ intervalla (pro vario
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oculorum ſitu) nunc magìs, nunc minùs deduci, ſic ut ſubinde coadu-
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nari videantur. </
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<
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xml:space
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">Nempe ſi oculus P ad F concipiatur tranſlatus, duca-
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túrque FG ipſi PO parallela, & </
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in C poſitus concipiatur; </
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<
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xml:space
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">quoniam FE minor eſt quàm FG, radius
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MO per G non tranſibit; </
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<
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jam conſiſtet imago α, ab altera _a_; </
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modi diverſitatum haud diſpar aſſignari poterit ratio.</
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quod obſervetur: </
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FAG (ſpeculo propiùs ad motam) contemplare. </
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<
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xml:space
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">Et primò quidem
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oculo O (altero P occluſo) cernes ejus imaginem φαγ; </
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lo O occluſo) altero P conſpicies imaginem fag, à priore φαγ ali-
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quantùm deflectentem; </
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<
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itlas in unam coalitas percipies; </
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quam notabili diſcrimine, ampliorem priorum ſingularum alterutrà.</
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<
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">Exhinc, obiter, ſuſpicari licet, etiam intuitum ſimplicem adhiben-
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tibus objecta binis oculis ſpectata tantillo majora videri, quàm uno;
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</
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<
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ſi mavis; </
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">per phialam conicam aut cylindricam aquâ repletam) MBN
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tranſlucentem lucernulæ flammam A ſpecta; </
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</
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<
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">obſervabis (pro oculorum ſitu magìs à ſe minúſve diſſitas) quarum
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una (a) clauſo oculo O, altera (_a_) clauſo P evaneſcet.</
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<
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">Videtur hæc inſtantia vel ſola ſufficere vulgari ſententiæ refellendæ;
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178.</
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juxta quam (ut _Keplerus_ alicubi colligit) puncti A ſimplex imago
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ad punctum X conſiſteret.</
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