Barrow, Isaac, Lectiones opticae & geometricae : in quibus phaenomenon opticorum genuinae rationes investigantur, ac exponuntur: et generalia curvarum linearum symptomata declarantur

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22532 larum æquidiſtat recta, pariter omnibus æquidiſtat, ut in elemento
primo
demonſtratur.
Operæ pretium exiſtimavit _Apollonius_ hoc de _parabola, & byper-_
11I. 22. _bola_ ſpeciatim demonſtrare.
VIII. Simili modo patet rectas quaſcunque curvas tangentes una
tantùm
excipitur, ad extremum lineæ recurrentis.
Vid. 18. hujus.
Iiſdem parallelis occurrere. Etiam hoc, quoad _ſectiones conicas_, uno
22I. 24, 25. vel altero _Theoremate_ demonſtravit _Apollonius_.
Cùm enim omnes ipſi AZ parallelas ſecent etiam infinitè pro-
ductæ
curvam ſecent oportet.
_Hujuſmodi Symptomatis demonſtra-_
33I. 27, 28. _tioni in ſectionibus conicis_ laborioſam operam impendit _Apolloniu_.

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