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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">IN deducendis è propoſitâ generatione curvarum affectionibus etiam-
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num progredimur.</
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<
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puncta, ſibimet inæquales ſunt; </
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<
s
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xml:space
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">minores ſunt illi qui puncto A (ſe@@
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vertici) propiores ſnnt.</
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">Tangant rectæ TM, XN; </
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<
s
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">ad AY parallelæ ſint MP, NQ,
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dico fore angulum PMT minorem angulo QNX.</
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">Nam producta recta TM occurret ipſi QN extra curvam pro-
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tractæ, puta ad E. </
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curvam, puta ad H. </
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ad alias, ac alias partes rectæ ME, rectas ME, NH ſeſe inter-
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ſecare inter parallelas PH, QE; </
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">quare major eſt angulus externus
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QNX interno QET, hoc eſt angulo PMT: </
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dinatim applicatas per puncta contactuum; </
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<
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QN protenſas.</
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<
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ternum ſcilicet interno.)</
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<
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quaſvis aliis parallelas) cur
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væ obliquiùs incidere quàm remotiores.</
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<
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ut in edito nuper VI _conicorv
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m libro_ eſt videre</
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rectum eſſe, vel obtuſum) _dico curvæ arcum MN rectâ NH, ma-_
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_jorem eſſe; </
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