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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<
s
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xml:space
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">CR, refractus N _a_ cum AC retrò tractus
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conveniet.</
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<
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<
s
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<
s
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<
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<
s
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<
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lus.</
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<
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<
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<
s
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<
s
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tingere nequit.</
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<
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<
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<
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<
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">refractus N _a_ prorsùm excurrens axi oc-
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currit.</
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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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<
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<
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<
s
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">omnes refracti directè progredientes ad AC
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">Fig. 133.</
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convergunt. </
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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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">Quum AN = CR, evidens eſt omnes arcui BN incidentes
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retrorſum verſus CA refractos convergere; </
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<
s
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NT cadentes antrorſum verſus CB refringi.</
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<
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<
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135, 136.</
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puncti radiantis intervallo ſubnaſcentes ſpeciales caſus comprehendi;
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</
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<
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vel omnes ad ipſum convergunt, vel aliqui divergunt, alii convergunt,
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his intercedente medio quodam ad illum parallelo. </
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<
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diſcrimina videbatur operæ pretium ac determinâſſe. </
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<
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etiam quoad reliquos generales caſus ſimpliciùs ſeſe rem habere; </
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ſcilicet eodem ſemper modo: </
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<
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dentium refracti directè procedentes ab axe divergunt; </
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<
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<
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eorum, qui convexo ratiori impungunt; </
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<
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fractionum legibus immediatè ſequitur, & </
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<
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linearum ductu diluceſcit. </
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<
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mus.</
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<
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</
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<
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ſeat.</
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<
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<
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<
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<
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Num. 25.
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Fig. 137.</
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CK. </
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<
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<
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<
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centro F, intervallo FG deſcribatur circulus refringentem interſecans
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ad N; </
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<
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<
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<
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<
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<
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tatim KG. </
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<
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</
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<
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<
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<
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