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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. VII.</
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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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piam X, erit A + X. </
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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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<
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<
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<
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">&</
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B. </
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<
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<
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<
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<
s
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<
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L, N ſumpto puncto quopiam E, alteróque G extra LN (verſus Z);
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<
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<
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<
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<
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partes MZ:</
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<
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ergo FE &</
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<
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<
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<
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ſecantes punctis L, K, dico fore D S. </
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<
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<
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<
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<
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<
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PT. </
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<
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interſecent per B ductæ quæpiam duæ rectæ BS, BR punctis L, K;
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</
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<
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<
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<
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unde conſtat junctas PM, PN, PO ipſis TB, SB, RB (reſpectivè)
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parallelas eſſe. </
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<
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TD = PD x
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. </
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<
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<
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DM x TD = DN x SD = DM x SD + MN x SD, tranſpo-
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nendóque DM x TD - DM x SD = MN x SD. </
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