Barrow, Isaac
,
Lectiones opticae & geometricae : in quibus phaenomenon opticorum genuinae rationes investigantur, ac exponuntur: et generalia curvarum linearum symptomata declarantur
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oſtenſis) curva OGO _Ellipſis_, quam recta GT tangit. </
s
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<
s
xml:id
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echoid-s11399
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xml:space
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">ergò recta
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GT curvam CGD quoque tanget.</
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<
s
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echoid-s11400
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</
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<
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<
s
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echoid-s11401
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xml:space
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">XVI Sit curva quæpiam AFB (cujus axis AD, & </
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<
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xml:space
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">ad hunc ap-
<
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<
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left
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xlink:label
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note-0246-01
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note-0246-01a
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xml:space
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">Fig. 90.</
note
>
plicata DB) ſit etiam alia curva VGC ad iſtam ſic relata, ut a deſig-
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nato quodam in axe AD puncto Z ad curvam AFB utcunque ductâ
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rectâ ZF, & </
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<
s
xml:id
="
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xml:space
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">per F ductâ rectâ EFG ad DBC parallelâ, ſit EG
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æqualis ipſi ZF; </
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<
s
xml:id
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echoid-s11404
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xml:space
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">ſit autem PQ perpendicularis curvæ AFB; </
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<
s
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echoid-s11405
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xml:space
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matúruqe QR æqualis ipſi ZE; </
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<
s
xml:id
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echoid-s11406
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xml:space
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">connexa recta GR ipſi curvæ VGC
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perpendicularis erit.</
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<
s
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</
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<
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<
s
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xml:space
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">Nam ducatur FT ad ipſam FQ perpendicularis, ſeu curvam AFB
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tangens; </
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<
s
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xml:space
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">& </
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<
s
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xml:space
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">concipiatur curva OGO talis, ut ductâ quâcunq; </
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<
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xml:space
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">rectâ
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HKO ad EFG parallelâ ( quæ rectas TE, TF, & </
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<
s
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">curvam OGO
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ſecet punctis H, K, O) connexâque ZK, ſit HO = ZK; </
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<
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">(_a_)_Hyp_.</
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ctâ Z I, quoniam HK &</
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<
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<
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quare curva OGO curvam VGC tangit. </
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<
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xml:space
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"> Eſt autem OGO (ex oſtenſis) _Hyperbola_, cui perpendicularis eſt recta GR; </
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">eadem
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itaque GR curvæ VGC quoque perpendicularis erit: </
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<
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">Sint recta DQ, duæque curvæ DRS, DYX ità relatæ,
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<
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">Fig. 91.</
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ut ductâ utcunque rectâ REY ad poſitione datam DB parallelâ (quæ
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dictas lineas ſecet, ut perſpicis) connexâque rectâ DY, ſit ſemper
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RY. </
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<
s
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">tangat autem recta RF curvam DRS ad R;
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</
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<
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<
s
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">Concipiatur linea DYO talis, ut ductâ utcunque GO ad DB pa-
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rallelâ ( quæ lineas FR, FP, DYO ſecet punctis G, P, O) connexâ-
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que DO ſit ſemper GO. </
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<
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<
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curvam DYX ad Y; </
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<
s
xml:id
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xml:space
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">Nam ſecet recta GO curvas DRS, DYX
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punctis S, X; </
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<
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">connectantur rectæ DG, DS, DX; </
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<
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varum natura) angulos XDP, DSP; </
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æquari; </
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<
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<
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gulus XDP angulo ODP major, adeóque PX major erit quàm PO;
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</
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VI.</
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hinc curva DYO curvam DYX tanget ad Y; </
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<
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_hyperbolæ_ ſuperiùs determinata; </
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<
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<
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<
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va DYX _ciſſois_ vulgaris; </
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<
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genitis) tangens hîc deſinitur.</
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<
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<
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