Bošković, Ruđer Josip
,
Theoria philosophiae naturalis redacta ad unicam legem virium in natura existentium
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evincunt illæ ſubſtantiæ, quæ aliarum poris injectæ eaſdem ex
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opacis pellucidas reddunt, ut charta oleo imbuta ſit pellucida,
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ſupplente aerem ipſo oleo, cum quo multo minus inæquali-
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ter in lumen agunt particulæ chartæ, quam agerent ſoli aeri,
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vel vacuo ſpatio intermixtæ. </
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<
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">Rem autem oculis ſubjicit vi-
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trum contuſum in minores particulas, quod ſola irregularita-
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te ſiguræ particularum temere ex contuſione naſcentium, & </
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aeris intermixti inæqualitate fit opacum per multiplicationem
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reflexionum, & </
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">nec aliam ob cau-
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ſam aqua in glaciem bullis continuis interruptam abiens pel-
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luciditatem amittit, ut & </
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<
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">alia corpora ſane multa, quæ, dum
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concreſcunt vacuolis interrupta, illico opaca fiunt.</
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non oriri ab im-
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pactu, ſed ab
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inæqualitate vi-
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rium in muta-
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tione medii:
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ubi pro reſra-
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ctionis explica-
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tione præmiſſa
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principia.</
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<
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">Quamobrem nec reflexio inde ortum ducit, ſed habe-
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tur etiam in pellucidis corporibus ex inæqualitate virium ſeu
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repellentium, ſeu attrahentium, uti in Optica ſua Newtonus
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tam multis notiſſimis argumentis demonſtravit, quorum unum
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eſt illud ipſum ex aſperitate ſuperſiciei cujuſcunque cujuſvis
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corporis, utcunque nobis, nudo potiſſimum inſpectantibus ocu-
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lo, lævis appareat, & </
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<
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">ex eadem cauſa oritur etiam refractio. </
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eſſet ſatis magna; </
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">impediret etiam hujuſce inæqualitatis effe-
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ctum, qui provenit a diverſa mediorum conſtitutione: </
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ex ipſis reflexionibus, & </
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">refractionibus in mutatione medii,
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conjunctis cum propagatione rectilinea per medium homoge-
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neum, patet, celeritatem illam tantam luminis ſatis eſſe ma-
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gnam ad eludendam illam inæqualitatem tanto minorem, quæ
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habetur in mediis homogeneis, non illam tanto majorem,
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quæ oritur a mediorum diſcrimine. </
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nis explicationem ex Mechanica requiritur, expoſuimus a num. </
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302, ubi adhibuimus principium illud virium inter duo plana
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parallela agentium æque in diſtantiis æqualibus ab eorum utro-
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que, cujus explicationem ad luminis particulas jam expediemus.</
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<
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">Re$ert M N in fig. 70 $uperficiem dirimentem duo media_, G E
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viam radii advenientis, H particulam luminis; H E celeritatem ejus ab-
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ſolutam, H S parallelam, S E perpendicularem, quæ eſt eo minor, quo ra-
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dius incidit magis obliquus: a b c eſt ſpbæra, intra quam babetur actio
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ſenſibilis in particulam H, quæ eſt adbuc tota in priore medio: X, X′,
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X″ ſunt loca plura particulæ progredientis inter plana A B, C D paralle-
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la ſuperficiei M N, ſita ad diſtantiam ab ea æqualem ſemidiametro ſpbæ-
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ræ H c. Particula ſita inter illa plana ubicunque, ut in X, ea ſpbæra ba-
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bebit ſuum ſegmentum F R L ultra ſuperſiciem M N: ſit ejus axis R T,
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& eodem axe ſegmentum Q T Z priori æquale, ac m n planum per centrum pa-
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rallelum M N. Segmenta m F L n, m Q Z n ejuſdem medii agent æqua-
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liter. Segmenta F R L, Q T Z inæqualiter, ſed eorum vires dirigentur per
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axem T R in alteram e binis plagis oppoſitis; adeoque & differentia virium
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dirigetur per eundem, qui quidem per pendicularis eſt utique planis A B,
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C D. Ea actione via incurva radii ſinuatur per X X′ X″. Prout vis diri-</
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illa ſphærula, cujus
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