Barrow, Isaac
,
Lectiones opticae & geometricae : in quibus phaenomenon opticorum genuinae rationes investigantur, ac exponuntur: et generalia curvarum linearum symptomata declarantur
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_Carteſio_ quidem primò repertam, ſed ab aliis pleriſque recentioribus
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opticis _Merſenno. </
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<
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xml:space
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">Herigonio, Hobbio, Maignano_, quin & </
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<
s
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xml:space
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">ipſo ejus
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conſodale doctiſſimo _Ricciolo_ ſuſceptam & </
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<
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<
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<
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">cer-
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tè hujus Scientiæ non parùm intereſt veram deprehendi) labefactatum
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iret; </
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<
s
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xml:space
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">eam potiùs imprudens experientiæ Suffragio communivit. </
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<
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xml:space
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">Qui-
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nimò ſi quid inſit huic principio vitii, illud potiùs erit, quod in maxi-
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mis inclinationibus refractionis angulos exhibet apparentibus ali-
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quantillo majores; </
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<
s
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xml:space
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">quæ tamen diſcrepantia num ipſius legis hujus, an
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experimentorum defectui, vel accidentariis quíbuſdam intervenienti-
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bus cauſis adſcribi debeat, haud facilè pronunciaverim. </
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<
s
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xml:space
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">Nec enim
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fortaſſis cognata reflectionis lex, a nemine non admiſſa, experimen-
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tis omnibus præciſè reſponderet. </
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<
s
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xml:space
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">Nobis ſuſficiet quòd in reliquis in-
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clinationibus, mediis præſertim, dicta lex experientiæ, quam præfe-
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runt authores, perquam conſentanea reperitur; </
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<
s
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xml:space
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">addo, quòd ab ea de-
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ductæ concluſiones cum experientia mirè conſpirant; </
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<
s
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xml:space
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">nec ab ea quòd
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animadvertere potuerim, unquam diſcordant. </
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<
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xml:space
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">Eam proinde (cùm alia
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probabilis haud ſuppetat, Geometricis, ratiociniis præſternenda) non
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verebimur ubivis ut ratam ſumere, ac adhibere; </
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<
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xml:space
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">ſatis certi (apud nos
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ſaltem) in elicitis ab ea concluſionibus haud omnino quicquam nota-
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bilis erroris emerſurum.</
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<
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">παρεπβαπκ\~ες problemation quoddam interſeram
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(quia Schema num. </
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">ſuperius ei gratis inſerviet, ejuſque conſtructio
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è ſuperiore conſtructione derivatur.) </
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">Per datum in refringente pun-
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ctum (B) incidentem ducere, cui datus conveniat angulus refractionis.
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</
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<
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">Ducatur BP refringenti perpendicularis (hanc autem duci poſſe ſup-
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ponimus, aut poſtulamus) & </
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">ad diametrum BP conſtruatur ſemicir-
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culus; </
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xml:space
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">R (pro PG verò præſtat ipſam
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diametrum PB accipere) ſumatúrque Arcus GK ſubtendens angulum
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parem dato. </
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occurrat in δ. </
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<
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">demum accipiatur Arcus δ H = GK, erit ductæ BH
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refractus B δ (uti præcedentem diſcurſum invertendo non difficilè col-
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ligitur) adeóque liquet factum eſſe quod erat propoſitum. </
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ordinem; </
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">Cujuſcunque generis lineæ RBS incidat radius MNO ad N,
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ſitque dictæ lineæ perpendicularis recta NC; </
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<
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ſumpto puncto C, per hoc tranſeat incidenti parallela CB; </
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<
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conveniat ipſius MO inflexus GNK; </
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<
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xml:space
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</
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