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

Table of handwritten notes

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            moveatur corpus progrediens, eſſet in ratione temporis, ſive
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            conſtans: </s>
            <s xml:space="preserve">nam plures quidem eodem tempore particulæ eam
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            vim exercent, ſed breviore tempore durat ſingularum actio,
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            adeoque ſumma evadit conſtans. </s>
            <s xml:space="preserve">Verum ſi velocitas corporis
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            progredientis ſit major; </s>
            <s xml:space="preserve">particulæ magis compinguntur, & </s>
            <s xml:space="preserve">ad
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            ſe invicem accedunt magis, adeoque major eſt itidem vis.
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            </s>
            <s xml:space="preserve">Quare ejuſmodi reſiſtentia eſt partim conſtans, ſive, ut vocant,
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            in ratione momentorum temporis, & </s>
            <s xml:space="preserve">partim in aliqua ratione
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            itidem velocitatis.</s>
            <s xml:space="preserve"/>
          </p>
          <note position="left" xml:space="preserve">Quam legem
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          videantur innu-
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          ere experimen-
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          ta: in viſcoſis
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          reſiſtentiam eſ-
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          ſe majorem.</note>
          <p>
            <s xml:space="preserve">444. </s>
            <s xml:space="preserve">Porro ex experimentis nonnullis videtur erui, reſiſten-
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            tiam in nonnullis fluidis eſſe partim in ratione duplicata ve-
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            locitatum, partim in ratione earum ſimplici, & </s>
            <s xml:space="preserve">partim con-
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            ſtantem, ſive in ratione momentorum temporis, quanvis ubi
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            velocitas eſt ingens, deprehendatur major: </s>
            <s xml:space="preserve">& </s>
            <s xml:space="preserve">ubi fluiditas eſt
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            ingens, ut in aqua, ut ſecundum reſiſtentiæ genus, quod eſt
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            magis irregulare, & </s>
            <s xml:space="preserve">incertum, ſit reſpectu prioris exiguum,
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            ſatis accedit reſiſtentia ad rationem duplicatam velocitatum.
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            </s>
            <s xml:space="preserve">Sed & </s>
            <s xml:space="preserve">illud cum Theoria conſpirat, quod viſcoſa fluida mul-
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            to magis reſiſtunt, quam pro ratione ſuæ denſitatis, & </s>
            <s xml:space="preserve">ve-
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            locitate corporis progredientis: </s>
            <s xml:space="preserve">nam in ejuſmodi fluidis, quæ
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            ad ſolida accedunt, illud ſecundum reſiſtentiæ genus eſt multo
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            majus, quod quidem in ſolidis uſque adeo creſcit: </s>
            <s xml:space="preserve">quanquam
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            & </s>
            <s xml:space="preserve">in iis intrudi per ingentem vim intra maſſam poteſt corpus
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            extraneum, ut clavus in murum, vel in metallum, quæ tamen,
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            ſi fragilia ſunt, & </s>
            <s xml:space="preserve">ſenſibilem compreſſionem non admittant,
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            diffringuntur.</s>
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          <p>
            <s xml:space="preserve">445. </s>
            <s xml:space="preserve">Jam vero quæcunque a Newtono primum, tum ab
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              <note position="left" xlink:label="note-0256-02" xlink:href="note-0256-02a" xml:space="preserve">Problemata alia
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              ad reſiſtentiam
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              pertinentia iti-
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              dem communia
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              huic Theoriæ.</note>
            aliis demonſtrata ſunt de motu corporum, quibus reſiſtitur in
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            variis rationibus velocitatum, ea omnia conſentiunt itidem cum
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            mea Theoria, & </s>
            <s xml:space="preserve">hujus ſunt loci, ac ad illam pertinent Me-
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            chanicæ partem, quæ agit de motu ſolidorum per fluida. </s>
            <s xml:space="preserve">Sic
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            etiam determinatio figuræ, cui minimum reſiſtitur, determi-
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            natio vis fluidi ſolidum impellentis directionibus quibuſcunque,
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            menſura velocitatis inde oriundæ per corporum objectorum
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            reſiſtentiam obſervatione definitam, innatatio ſolidorum in flui-
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            dis, ac alia ejuſmodi, & </s>
            <s xml:space="preserve">mihi communia ſunt: </s>
            <s xml:space="preserve">ſed oportet
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            rite diſtinguere, quæ ſunt hypothetica tantummodo, ab iis,
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            quæ habentur reapſe in Natura.</s>
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          <p>
            <s xml:space="preserve">446. </s>
            <s xml:space="preserve">Ad fluida, & </s>
            <s xml:space="preserve">ſolida pertinent itidem, quæcunque in
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              <note position="left" xlink:label="note-0256-03" xlink:href="note-0256-03a" xml:space="preserve">Alia pertinen-
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              tia huc pertra-
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              ctata in parte
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              ſecunda: diſcri-
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              men inter ela-
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              ſtica, & mol-
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              lia.</note>
            parte ſecunda demonſtrata ſunt de preſſione fluidorum, & </s>
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            velocitate in effluxu, quæcumque de æquilibrio ſolidorum, de
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            vecte, de centro oſcillationis, & </s>
            <s xml:space="preserve">percuſſionis, quæ quidem in
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            Mechanica pertractari ſolent. </s>
            <s xml:space="preserve">Illud unum addo, ex motu fa-
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            cili particularum fluidi aliarum circa alias, & </s>
            <s xml:space="preserve">irregulari earum
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            congeſtione, facile deduci, debere preſſionem propagari quaqua-
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            verſus. </s>
            <s xml:space="preserve">Sed de his jam ſatis, quæ ad ſoliditatem, & </s>
            <s xml:space="preserve">fluiditatem
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            pertinent: </s>
            <s xml:space="preserve">illud vero, quod pertinet ad diſcrimen inter elaſtica,
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            & </s>
            <s xml:space="preserve">mollia, brevi expediam. </s>
            <s xml:space="preserve">Elaſtica ſunt, quæ poſt </s>
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