Bernoulli, Daniel, Hydrodynamica, sive De viribus et motibus fluidorum commentarii

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            <s xml:id="echoid-s8994" xml:space="preserve">
              <pb o="301" file="0315" n="315" rhead="SECTIO DECIMA TERTIA."/>
            garem æſtimationem invenio præter propter æqualem ponderi 40. </s>
            <s xml:id="echoid-s8995" xml:space="preserve">ped. </s>
            <s xml:id="echoid-s8996" xml:space="preserve">cub.
              <lb/>
            </s>
            <s xml:id="echoid-s8997" xml:space="preserve">aquæ; </s>
            <s xml:id="echoid-s8998" xml:space="preserve">iſta vero vis non continue applicatur, ſed tantum eo tempore quo re-
              <lb/>
            mi retrahuntur: </s>
            <s xml:id="echoid-s8999" xml:space="preserve">ſunt igitur duo trientes iſtius vis auferendi, ita ut vis quæ tri-
              <lb/>
            remem continue propellat, cenſenda denique ſit æqualis ponderi 13 {1/3}. </s>
            <s xml:id="echoid-s9000" xml:space="preserve">ped. </s>
            <s xml:id="echoid-s9001" xml:space="preserve">cub. </s>
            <s xml:id="echoid-s9002" xml:space="preserve">
              <lb/>
            aquæ.</s>
            <s xml:id="echoid-s9003" xml:space="preserve"/>
          </p>
          <p>
            <s xml:id="echoid-s9004" xml:space="preserve">Exinde ſequitur, ſi velocitates navis rationem ſequi ſubduplicatam vi-
              <lb/>
            rium propellentium ponantur, quod eadem hæc triremis pondere unius pedis
              <lb/>
            cubici aquæ impulſa velocitatem habitura fuiſſet, qua poſſit ſingulis minutis
              <lb/>
            ſecundis perficere proxime duos pedes; </s>
            <s xml:id="echoid-s9005" xml:space="preserve">quæ hypotheſis eadem eſt, cum illa
              <lb/>
            quam primo loco adhibuimus, ita ut rurſus exinde ſequatur triremem velo-
              <lb/>
            citatem ab iſta navigatione acquiſituram eſſe, qua poſſit perficere ſingulis mi-
              <lb/>
            nutis ſecundis 7 {1/2} pedes, quæ velocitas tantillo major eſt illa, quæ triremi re-
              <lb/>
            migatione fortiſſima 260. </s>
            <s xml:id="echoid-s9006" xml:space="preserve">remigum data fuit.</s>
            <s xml:id="echoid-s9007" xml:space="preserve"/>
          </p>
          <p>
            <s xml:id="echoid-s9008" xml:space="preserve">Rebus bene perpenſis hæſito, utrum navigationis genus ſit præferen-
              <lb/>
            dum, an remigatio, an aquarum elevatio, ſucceſſum fere æqualem credide-
              <lb/>
            rim utriuſque, & </s>
            <s xml:id="echoid-s9009" xml:space="preserve">pro certo affirmare audeo, ſi minus promoveatur navis ab
              <lb/>
            aquarum elevatione, defectum parvum fore: </s>
            <s xml:id="echoid-s9010" xml:space="preserve">fortaſſe autem promovebitur
              <lb/>
            magis. </s>
            <s xml:id="echoid-s9011" xml:space="preserve">Interim non dubito, quin nova iſta navigationis idea harum rerum
              <lb/>
            ignaris vana & </s>
            <s xml:id="echoid-s9012" xml:space="preserve">ridicula appareat. </s>
            <s xml:id="echoid-s9013" xml:space="preserve">Ego vero aliter ſentio velimque ut animus
              <lb/>
            porro ad ſequentia advertatur.</s>
            <s xml:id="echoid-s9014" xml:space="preserve"/>
          </p>
          <p>
            <s xml:id="echoid-s9015" xml:space="preserve">Primo. </s>
            <s xml:id="echoid-s9016" xml:space="preserve">Quod aquæ in omni navium genere, ubi remi plane adhiberi
              <lb/>
            nequeunt, commode elevari poſſunt, ita ut nova iſta navigatione naves etiam
              <lb/>
            bellicæ prægraves, quibus in pugnis navalibus utuntur, deficiente omni vento,
              <lb/>
            quo lubet agi poſſint.</s>
            <s xml:id="echoid-s9017" xml:space="preserve"/>
          </p>
          <p>
            <s xml:id="echoid-s9018" xml:space="preserve">Secundo. </s>
            <s xml:id="echoid-s9019" xml:space="preserve">Quod ſic in theoria exemplum habetur, dari vires motrices
              <lb/>
            ſive propellentes, quæ dici poſſunt intrinſecæ: </s>
            <s xml:id="echoid-s9020" xml:space="preserve">Excitabuntur iſto exemplo
              <lb/>
            ingenia ad excogitanda hujuſmodi alia motus principia eaque magis perficien-
              <lb/>
            da & </s>
            <s xml:id="echoid-s9021" xml:space="preserve">ad navigationis uſum adhibenda.</s>
            <s xml:id="echoid-s9022" xml:space="preserve"/>
          </p>
          <p>
            <s xml:id="echoid-s9023" xml:space="preserve">Tertio. </s>
            <s xml:id="echoid-s9024" xml:space="preserve">Quod multis modis ſublevari poteſt labor hominum in elevan-
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            dis aquis ſecus atque fieri poteſt in remorum uſu: </s>
            <s xml:id="echoid-s9025" xml:space="preserve">ſunt nempe res naturales
              <lb/>
            inſigni & </s>
            <s xml:id="echoid-s9026" xml:space="preserve">fere incredibili virtute præditæ eæque mediocri pretio comparandæ,
              <lb/>
            quibus idem quod labore hominum effici poteſt: </s>
            <s xml:id="echoid-s9027" xml:space="preserve">harum uſus præſertim </s>
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