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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<
s
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">Si A cadat extra BC, fiat AB - {R/I} AC. </
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<
s
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">AB :</
s
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<
s
xml:id
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s
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<
s
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<
s
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">ſin A
<
lb
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<
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">Fig. 159.</
note
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cadat inter B, C; </
s
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<
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<
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<
s
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<
s
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s
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<
s
xml:id
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">deinde fac
<
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{I/R} KZ - DZ. </
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<
s
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<
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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<
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<
s
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">Si punctum A extra BC ponatur, fiat AB + {I-2R/I} AC :</
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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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">fiat AB+{2R-I/I} AC. </
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<
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">AC :</
s
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<
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<
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BC. </
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<
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s
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<
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s
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<
s
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">cape CY ad partes centri verſus A.</
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<
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161.</
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<
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<
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<
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<
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<
s
xml:id
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<
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<
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{R/I} AC - AB. </
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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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">{I/R} KZ - DZ. </
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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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xml:space
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">& </
s
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<
s
xml:id
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verſus A.</
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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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cape BZ adverſus A. </
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<
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{I/R} KZ &</
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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
xml:id
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xml:space
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s
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<
s
xml:id
="
echoid-s6841
"
xml:space
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">cape DY
<
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verſus A.</
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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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<
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<
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<
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<
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<
s
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">DZ, fac DZ - {I/R} KZ. </
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<
s
xml:id
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s
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<
s
xml:id
="
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">: DK.
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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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">DZ :</
s
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<
s
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<
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DK. </
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<
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<
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">& </
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<
s
xml:id
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