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

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            <s xml:id="echoid-s330" xml:space="preserve">
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            centia, corpora propellere; </s>
            <s xml:id="echoid-s331" xml:space="preserve">quæ & </s>
            <s xml:id="echoid-s332" xml:space="preserve">pari modo proximè ſuccedentibus
              <lb/>
            vim inferent, & </s>
            <s xml:id="echoid-s333" xml:space="preserve">ita continuò, ſic ut ſimul & </s>
            <s xml:id="echoid-s334" xml:space="preserve">ſemel indefinitè protenſa
              <lb/>
            talium corpuſculorum ſeries promoveatur, & </s>
            <s xml:id="echoid-s335" xml:space="preserve">antrorſum connitatur;
              <lb/>
            </s>
            <s xml:id="echoid-s336" xml:space="preserve">qualis utrolibet modo producta lucis propago radius conſuevit appella-
              <lb/>
            ri. </s>
            <s xml:id="echoid-s337" xml:space="preserve">Ità quidem rem exiſtimo ſimpliciter obtingere, donec medìum
              <lb/>
            permanet homogeneum, hoc eſt ejuſdem fermè magnitudinis, ſolidi-
              <lb/>
            tatis, ac figuræ partibus conſtans, & </s>
            <s xml:id="echoid-s338" xml:space="preserve">ſimilibus interſtitiis pervium; </s>
            <s xml:id="echoid-s339" xml:space="preserve">at
              <lb/>
            ſi medium occurrat aliter affectum, è diverſis quippe ſecundum quan-
              <lb/>
            titatem aut figuram particulis compactum, poriſque laxioribus, aut
              <lb/>
            ſtrictioribus pertuſum, cujúſque proinde materia vel promptius cedat,
              <lb/>
            aut contumaciùs obluctetur, oportebit illius ſeu curſus, ſeu impulſùs
              <lb/>
            vim, effectúmque demutari; </s>
            <s xml:id="echoid-s340" xml:space="preserve">quin & </s>
            <s xml:id="echoid-s341" xml:space="preserve">ſi novi medii ſuperficies ita tran-
              <lb/>
            ſeunti lucis amni ſe obliquam objiciat, ejus quoque directionem infrin-
              <lb/>
            gi; </s>
            <s xml:id="echoid-s342" xml:space="preserve">vel ἀνακλασιν contingere, quam _Ariftoteles_ vocat, eo nomine
              <lb/>
            (quas nunc diſtinguere ſolemus) reflectionem ſimul ac refractionem
              <lb/>
            complectens. </s>
            <s xml:id="echoid-s343" xml:space="preserve">Enimverò materiæ impingens ità compactæ, ut venienti
              <lb/>
            tranſi um perneget, aut prementis impetum inconcuſſa ſuſtineat aliò tota
              <lb/>
            quò facillimè poterit & </s>
            <s xml:id="echoid-s344" xml:space="preserve">directiſſimè, regredietur & </s>
            <s xml:id="echoid-s345" xml:space="preserve">reſiliet; </s>
            <s xml:id="echoid-s346" xml:space="preserve">aliò vim
              <lb/>
            ſuam quàm retinet omnem derivabit; </s>
            <s xml:id="echoid-s347" xml:space="preserve">id quod lucis reflectio dicitur
              <lb/>
            (Hujuſmodi verò corpus lucem non ſuſcipiens eatenus opacum, (Hoc
              <lb/>
            eſt terrenum, ut Grammatici volunt, ab Opevocabulo priſco tellurem
              <lb/>
            deſignante) appellatur; </s>
            <s xml:id="echoid-s348" xml:space="preserve">quatenus autem ſibimet incurrentem aliò
              <lb/>
            projicit, illuſtratum dici; </s>
            <s xml:id="echoid-s349" xml:space="preserve">quatenus objecti ſpeciem redhibet aſpicienti,
              <lb/>
            ſpeculum.) </s>
            <s xml:id="echoid-s350" xml:space="preserve">Quòd ſi verò materia luci progredienti ſic obviam facta
              <lb/>
            tranſitum utcunque præbeat, ejuſve conatum excipiat, lentiùs tamen
              <lb/>
            aut paratiùs præ illa, per quam priùs decurrebat, tum virtutis ſuæ
              <lb/>
            quantitate aliquantùm hinc variatâ ſimul à recto quod affectabat itinere
              <lb/>
            deflectetur; </s>
            <s xml:id="echoid-s351" xml:space="preserve">eo nimirum ordine modóque quem poſthac conabimur
              <lb/>
            elicere. </s>
            <s xml:id="echoid-s352" xml:space="preserve">Qualis effectus refractionis nomine venire ſolet(ſubnotetur
              <lb/>
            autem, hoc modo lucem intromittens medium eatenus perſpicuum,
              <lb/>
            diaphanum, tranſparens, pellucidum appellari.) </s>
            <s xml:id="echoid-s353" xml:space="preserve">Ità lucis naturam,
              <lb/>
            originem, propagationem, ac progreſſum ὀλχερῶς (omiſſis quæ adjun-
              <lb/>
            gi poſſent pleriſque minùs ad noſtrum propoſitum ſpectantibus) expo-
              <lb/>
            no; </s>
            <s xml:id="echoid-s354" xml:space="preserve">nec aliud ferè præter hæc requiro declarandis hypotheſibus, quos
              <lb/>
            communiter adſumunt Optici; </s>
            <s xml:id="echoid-s355" xml:space="preserve">quæque neceſſariò debent huic extru-
              <lb/>
            endæ Scientiæ præſterni. </s>
            <s xml:id="echoid-s356" xml:space="preserve">Comprobandis autem iis, quæ dixi non in-
              <lb/>
            cumbam; </s>
            <s xml:id="echoid-s357" xml:space="preserve">cùm & </s>
            <s xml:id="echoid-s358" xml:space="preserve">(quod inſtituto noſtro ſatis eſt) talia dari poſſe non
              <lb/>
            minùs ipſâ luce clarum videatur, imò reverà dari complura declarent
              <lb/>
            experimenta. </s>
            <s xml:id="echoid-s359" xml:space="preserve">Opticas verò quas innui hypotheſes præcipuas ſubjunge-
              <lb/>
            mus, & </s>
            <s xml:id="echoid-s360" xml:space="preserve">nonnihil attentabimus explicare.</s>
            <s xml:id="echoid-s361" xml:space="preserve"/>
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