Caverni, Raffaello, Storia del metodo sperimentale in Italia, 1891-1900

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            <p type="main">
              <s>
                <pb xlink:href="020/01/1009.jpg" pagenum="452"/>
              niti. </s>
              <s>Tunc quidem conspicitur in papyro G umbra quidem secundaria HI
                <lb/>
              circularis non valde obsura sed diluta, cuius diameter HI maior est diame­
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                <figure id="id.020.01.1009.1.jpg" xlink:href="020/01/1009/1.jpg" number="158"/>
              </s>
            </p>
            <p type="caption">
              <s>Figura 92.
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              tro CD eiusdem globuli M, quia nimirum radii
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              penumbram, seu secundariam umbram termi­
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              nantes, ut sunt globum M tangentes AD et
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              BC decussati se mutuo secant in puncto F
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              inter solem S et pilam M positos, quare ab F
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              divergentes spatium HI umbrosum gignent
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              ampliorem quidem quam CD ” (pag. </s>
              <s>138). </s>
            </p>
            <p type="main">
              <s>Così le argomentazioni del Borelli e del­
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              l'Huyghens, e i fatti meglio osservati, che ve­
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              nivano a confortarle di nuova autorità, valsero
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              a levar via tutti i dubbii; ond'è che il Cas­
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              sini, trattando in quel suo Discorso
                <emph type="italics"/>
              De l'ori­
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              gine de l'Astronomie
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              dell'ecclissi de'Satelliti
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              di Giove, potè francamente, innanzi agli Ac­
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              cademici parigini, pronunziare queste parole:
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              “ En faisant ces observations on découvrit une
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              nouvelle espece d'éclipses, qui n'est pas moins
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              admirabile, que celles dont on avoit déja con­
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              noissance, c'est les éclipses que ces petite planettes font sur Juppiter en
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              passant entre son disque et celui du Soleil: on voit alors leurs petites om­
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              bres parcourir le disque de Jupiter d'orient en occident, et l'on peut deter­
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              miner la minute, que'elles parviennent au milieu de ce disque. </s>
              <s>On s'est
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              servy de ces deux sortes d'eclipses dans la correction des Tables ” (Divers
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              ouvr. </s>
              <s>d'Astronomie, Amsterdam 1736, pag. </s>
              <s>44). </s>
            </p>
            <p type="main">
              <s>Queste Tavole così corrette dovevano utilmente servire a sciogliere l'im­
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              portantissimo, e da molti anni desiderato, problema delle Longitudini, delle
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              quali ci resta ora a parlare, nè può tanto stringerci la brevità, da passare
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              in silenzio l'opera, che vi posero attorno, e i solleciti studii che vi dettero
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              i molti e illustri predecessori del Cassini. </s>
            </p>
            <p type="main">
              <s>
                <emph type="center"/>
              V.
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              </s>
            </p>
            <p type="main">
              <s>Il problema delle Longitudini fu in ogni tempo il desiderio de'Geo­
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              grafi, desiderio che si accese allora ne'loro animi più vivo, quando le ar­
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              dite navigazioni per lo sconfinato oceano fecero sentire più urgente il biso­
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              gno di risolvere quel difficile problema in qualche modo. </s>
              <s>Non è perciò
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              maraviglia se, dimostratosi questo bisogno al primo grande scopritore del
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              Nuovo mondo, gli incorasse una certa fiducia di sodisfarlo per via di quel
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              maraviglioso Strumento magnetico, mandato come si diceva a salvar l'uomo
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              pericolante in mare direttamente dal Cielo. </s>
            </p>
          </chap>
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