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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xml:space
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curvæ EXK, HZO ita verſus ſe, & </
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trariè in curva AMB accepto puncto M, & </
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<
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">ductâ MPX ad AD per-
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pendiculari, ſumptâ αμ = arc AM, ductâ μZ ad αβ perpendiculari,
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poſitóque rectam TM curvam AMB tangere; </
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<
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</
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<
s
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">erunt ſpatia ADKE, α β OH æqualia ſibi.</
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ADB (rectis DA, DB, & </
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<
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205.</
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definitum) ſint item curvæ EXK, HZO ità relatæ, ut ſi quodvis
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capiatur punctum M in curva AMB, projiciatur recta DMX, ſuma-
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tur αμ = arc AM; </
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DT perpendicularis ipſi DM; </
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<
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TD. </
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duplum.</
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