Fabri, Honoré, Tractatus physicus de motu locali, 1646

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    <archimedes>
      <text>
        <front>
          <section>
            <p id="N104E5" type="main">
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              duobus præſertim conſiſtit; </s>
              <s id="N104F5">primò, eò quòd medium detrahat ali­
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              quid grauitationis corporis grauis; </s>
              <s id="N104FB">ſecundò, eò quòd partes medij
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              aliquam implicationem habeant, quæ ſolui non poteſt ſine aliqua
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              compreſſione, vel tenſione; </s>
              <s id="N10503">vtraque autem reſiſtit impetui: quod
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              ſpectat ad primum, ſi medium ſit æqualis grauitatis cum ipſo cor­
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              pore, detrahitur tota grauitatio, ſi ſubduplæ ſubduplum, &c. </s>
              <s id="N1050B">de quo
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              aliàs. </s>
            </p>
            <p id="N10510" type="main">
              <s id="N10512">8. Hinc corpus graue per medium rarius, cæteris paribus, fa­
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              cilè deſcendit; non tamen ex reſiſtentia medij cognita, poteſt co­
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              gnoſci proportio grauitatis vtriuſque, propter ſecundum caput, ex
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              quo etiam petitur reſiſtentia. </s>
              <s id="N1051C">Idem corpus cum eodem medio
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              comparatum, habet tres coniugationes: nam, vel eſt grauius, vel­
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              eſt grauius, vel æquè graue, vel minùs. </s>
              <s id="N10524">Sunt etiam tres aliæ con­
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              iugationes, ſcilicet, eiuſdem mobilis cum diuerſis mediis, duorum
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              mobilium cum eodem medio, duorum mobilium cum duobus
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              mediis. </s>
            </p>
            <p id="N1052D" type="main">
              <s id="N1052F">9. Figura corporis grauis deorſum cadentis motum vel retardat
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              vel accelerat; </s>
              <s id="N10535">retardat quidem, ſi plures partes medij amouendæ
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              ſunt vel pauciores velociori motu; accelerat è contrario: </s>
              <s id="N1053B">hinc idem
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              corpus
                <expan abbr="parallelipedũ">parallelipedum</expan>
              iuxta tres diuerſos ſitus, triplici motu diuer­
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              ſo deſcendere poteſt: hinc ratio, cur acuminata tam facilè deſcen­
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              dant. </s>
              <s id="N10549">Cubus, qui deſcendit, imprimit aëri velociorem motum,
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              quàm ipſe habeat; & quò maior eſt eius ſuperficies, eò velociorem. </s>
            </p>
            <p id="N1054F" type="main">
              <s id="N10551">10. Duo globi, vel cubi eiuſdem materiæ æquè velociter deſ­
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              cendunt: </s>
              <s id="N10557">ratio eſt, quia, licèt maioris vires habeant maiorem pro­
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              portionem ad molem aëris reſiſtentis, quàm vires minoris ad alte­
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              ram aëris molem, quæ proprium illius motum retardat, cùm tamen
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              aër, qui reſiſtit maiori cubo, debeat amoueri velociori motu, quàm
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              aër, qui reſiſtit minori, ſitque eadem proportio reſiſtentiæ ratione
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              motus, minoris ad maiorem, quæ eſt ratione molis, maioris ad mi­
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              norem; </s>
              <s id="N10567">certè ratio compoſita vtriuſque erit eadem in vtroque cu­
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              bo: igitur æqualiter deſcendet vterque. </s>
            </p>
            <p id="N1056D" type="main">
              <s id="N1056F">11. Si tamen ſint diuerſæ materiæ, haud dubiè, qui conſtat leuio­
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              ri materia, tardiùs deſcendet; quia eius vires habent minorem
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              proportionem ad reſiſtentiam. </s>
              <s id="N10577">Corpuſcula etiam ex grauiſſima ma­
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              teria tardiſſimè deſcendunt: </s>
              <s id="N1057D">tum, quia à filamentis illis, quibus par­
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              tes aëris implicantur, facilè detinentur; </s>
              <s id="N10583">analogiam habes in lapil­
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              lo, qui ab araneæ tela intercipitur: </s>
              <s id="N10589">tum, quia, cùm latiſſimam ali­
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              quando habeant ſuperficiem pro modica mole, minimam habent </s>
            </p>
          </section>
        </front>
      </text>
    </archimedes>