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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. III.</
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xml:space
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">Q Uomodo per _motus ſimplices progreſſivum, & </
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<
s
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xml:space
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">converſivum_
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_ffectæ concipiantur magnitudines, & </
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<
s
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xml:space
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">qualia generationes iſtas_
<
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_conſequuntur ſymptomata_ (nonnulla ſaltem præcipua) _con-_
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_niſi ſumus exponere ad compoſitos nunc, & </
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<
s
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="
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xml:space
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">concurrentes,_
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_eidem propoſito ſervientes, motns accingimur;_ </
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<
s
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xml:space
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">quorum in effectis
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diſcernendis velocitates, ſecundum quas ſimplices peraguntur motus,
<
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omnino, vel cum primis conſiderandæ ſunt; </
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<
s
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">quarum in generatione
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per motus ſimplices nulla prorſus habetur ratio. </
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<
s
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xml:space
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">Per eundem enim
<
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motum ſimplicem ſeu velocior is ſit, ſeu tardior eadem magnitudo,
<
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quamvìs non eodem temporis intervallo, producitur; </
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<
s
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xml:space
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">idem nempe
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_circulus_ ex ejuſdem rectæ circa punctum in ea fixum, _eadem Sphæra_
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ex Semicirculi circa _diametrum_ rotatu; </
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<
s
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">quamvìs ut hæc fiant eò ma-
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gìs awt minus expectandum ſit, quo ſegnior aut citatior ſupponitur ea
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progenerans motus. </
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<
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">Verùm in generatione per motus compoſitos
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iiſdem manentibus lationis modis, prout unius aut plurium variatur
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velocitas, nedum ſpecie, ſed etiam quantitate diverſæ magnitudines
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emergere ſolent, poſitione ſaltem perpetuò differentes. </
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<
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">Ut ſi recta
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">Fig. 13.</
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AB per rectam AC parallelo deferatur æquabili motu; </
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">& </
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punctum M in AB deſcendat uniformiter; </
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<
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xml:space
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">vel ſimulrecta AC pa-
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rallelo quoque uniformi motu deſcendens ipſam AB promotam inter-
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ſecet in M; </
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<
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">ex ejuſmodi motuum compoſitione vel concurſu produ-
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cetur recta linea AM. </
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<
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">Quòd ſi eodem, etiam quoad velocitatem
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manente motu rectæ AB, immutetur in velocitate motus uniformis
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puncti M, vel rectæ AC, ità quidem punctum M jam eodem tem-
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pore pervenerit ad μ, vel AC ſecet ipſam AB in μ, deſcribetur
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hoc motu alia recta A μ à priore AM poſitione diverſa. </
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<
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">Sin verò,
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manente rurſus eodem motu rectæ AB, pro motu puncti M, vel
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rectæ AC uniformi ſubſtituatur motus, quem vocant, æqualiter
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acceleratus, ex ejuſmodi compoſitione, vel concurſu fiet </
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