Bošković, Ruđer Josip, Theoria philosophiae naturalis redacta ad unicam legem virium in natura existentium

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              <pb o="227" file="0279" n="279" rhead="PARS TERTIA."/>
            eſt perpendicularem velocitatem vel extinguere totam ante,
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            quam deveniatur ad planum ulterius, vel imminuere, vel au-
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            gere. </s>
            <s xml:space="preserve">In primo caſu debet particula retro regredi, & </s>
            <s xml:space="preserve">deſcri-
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            bere curvam ſimilem illi, quam deſcripſit uſque ad ejuſmodi
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            extinctionem, recuperando iiſdem viribus in regreſſu, quod
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            amiſerat in progreſſu, adeoque debet egredi in angulo reſlexio-
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            nis æquali angulo incidentiæ: </s>
            <s xml:space="preserve">in ſecundo caſu habetur refractio
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            cum receſſu a perpendiculo, in tertio refractio cum acceſſu ad
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            ipſum, & </s>
            <s xml:space="preserve">in utrolibet caſu, quæcunque fuerit inclinatio in in-
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            greſſu, debet differentia quadratorum velocitatis perpendicula-
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            ris in ingreſſu, & </s>
            <s xml:space="preserve">egreſſu eſſe conſtantis cujuſdam magnitudi-
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            nis ex principio mechanico demonſtrato num. </s>
            <s xml:space="preserve">176 in adn. </s>
            <s xml:space="preserve">& </s>
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            inde num. </s>
            <s xml:space="preserve">305 eſt erutum illud, ſinum anguli incidentiæ ad
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            ſinum anguli refracti debere eſſe in conſtanti ratione, quæ eſt
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            celeberrima lucis proprietas, cui tota innititur Dioptrica, & </s>
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            præterea illud num. </s>
            <s xml:space="preserve">306 velocitatem in medio præcedente ad
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            velocitatem in medio ſequente eſſe in ratione reciproca ſinuum
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            eorundem.</s>
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            <s xml:space="preserve">487. </s>
            <s xml:space="preserve">Hoc pacto ex uniſormi Theoria deductæ ſunt notiſſi-
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              <note position="right" xlink:label="note-0279-01" xlink:href="note-0279-01a" xml:space="preserve">Lumen debere
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              in corpora rea-
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              gere æqualiter:
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              hinc immenſa
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              lucis tenuitas:
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              qui effectus i
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              pſi
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              falſo tribuantur
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              a nonnullis.</note>
            mæ, ac vulgares leges reflexionis, ac refractionis, ex quibus
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            plura conſectaria deduci poſſunt. </s>
            <s xml:space="preserve">Inprimis quoniam debet actio
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            ſemper eſſe mutua, dum corpora agunt in lumen ipſum re-
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            flectendo, & </s>
            <s xml:space="preserve">refringendo; </s>
            <s xml:space="preserve">debet ipſum lumen agere in corpo-
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            ra, ac debet eſſe velocitas amiſſa a lumine ad velocitatem ac-
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            quiſitam a centro gravitatis corporis ſiſtentis lumen, ut eſt maſ-
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            ſa corporis ad maſſam luminis. </s>
            <s xml:space="preserve">Inde deducitur immenſa lumi-
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            nis tenuitas: </s>
            <s xml:space="preserve">nam maſſa tenuiſſima leviſſimæ plumulæ ſuſpen-
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            ſæ filo tenui, ſi impetatur a radio repente immiſſo, nullum
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            progreſſivum acquirit motum, qui ſenſu percipi poſſit. </s>
            <s xml:space="preserve">Cum
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            tam immanis ſit velocitas amiſſa a lumine; </s>
            <s xml:space="preserve">facile patet, quam
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            immenſa ſit tenuitas luminis. </s>
            <s xml:space="preserve">Newtonus etiam radiorum im-
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            pulſioni tribuit progreſſum vaporum cometicorum in caudam;
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            </s>
            <s xml:space="preserve">ſed eam ego ſententiam ſatis valido, ut arbitror, argumen-
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            to rejeci in mea diſſertatione De Cometis. </s>
            <s xml:space="preserve">Sunt, qui auro-
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            ras boreales tribuant halitibus tenuiſſimis impulſis a radiis ſo-
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            laribus, quod miror fieri etiam ab aliquo, qui radios putat
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            eſſe undas tantummodo, nam undæ progreſſivum motum per
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            ſe ſe non imprimunt: </s>
            <s xml:space="preserve">qui autem cenſent, & </s>
            <s xml:space="preserve">fluvios retardari
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            orienti Soli contrarios, & </s>
            <s xml:space="preserve">Terræ motus fieri ex impulſu ra-
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            diorum Solis, ii ſane nunquam per legitima Mechanicæ prin-
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            cipia inquiſiverunt in luminis tenuitatem.</s>
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            <s xml:space="preserve">488. </s>
            <s xml:space="preserve">Solis particulis tenuiſſimis corporum imprimunt mo-
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              <note position="right" xlink:label="note-0279-02" xlink:href="note-0279-02a" xml:space="preserve">Tenuiſſimum
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              motum impri-
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              mi a lumine
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              particulis cor-
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              porum: calorem,
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              & uſtionem pro-
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              venire ab earum
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              viribus internis,
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              quod ipſum pro-
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              batur hic.</note>
            tum radii, ex quo per internas vires aucto oritur calor, & </s>
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            quidem in opacis corporibus multo facilius, ubi tantæ ſunt
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            reflexionum, & </s>
            <s xml:space="preserve">refractionum internæ viciſſitudines: </s>
            <s xml:space="preserve">exiguo
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            motu impreſſo paucis particulis, reliqua internæ mutuæ vires
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            agunt juxta ea, quæ diximus num. </s>
            <s xml:space="preserve">467. </s>
            <s xml:space="preserve">Sic ubi radiis ſola-
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            ribus ſpeculo collectis comburuntur aliqua, alia </s>
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