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

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              <s>
                <pb xlink:href="020/01/600.jpg" pagenum="43"/>
              si percutiatur in B resonabit A in eodem instanti, et sonus ex B in A in
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              non tempore tunc ferretur, ex quo patet si quo tempore fit ictus in B de­
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              tegatur lumen dignosci ex A num illuminatio fiat in instanti ” (ibi, c. </s>
              <s>14).
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                <figure id="id.020.01.600.1.jpg" xlink:href="020/01/600/1.jpg" number="79"/>
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            </p>
            <p type="caption">
              <s>Figura 14.</s>
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            <p type="main">
              <s>Ma perchè per troppo breve di­
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              stanza pativa d'esser teso fra'due
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              anelli quel fil di ferro sonoro, per
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              avere spazii più ampii si rivolse il
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              Viviani a praticare i metodi già proposti da Galileo, e sotto il dì 14 Aprile 1657
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              si trova di sua propria mano scritto questo ricordo: “ Feci giorni sono l'espe­
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              rienza della luce nel modo insegnato da Galileo ” (MSS. Cim., T. X, c. </s>
              <s>181)
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              e si scelsero per le due stazioni il monte della Verrucola e il campanile di
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              Pisa (Targioni, Notiz. </s>
              <s>cit., T. II, P. II, pag 585, 86). </s>
            </p>
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              <s>Fu a questa occasione che avendo risaputo il Borelli, professore di Ma­
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              tematiche in quello studio, de'preparativi che si facevano per l'esperienza,
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              si sentì eccitato a speculare un più facile e più squisito modo di praticarla. </s>
              <s>
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              Di ciò Cosimo Galilei, giovane, e che per ragione di studii soggiornava al­
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              lora in Pisa, dava conto, con lettera del dì 4 Aprile 1657, al Viviani. </s>
            </p>
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              <s>“ Qui in Pisa vo godendo la conversazione dell'Ecc.mo sig. </s>
              <s>Borelli e
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              dell'Illustriss. </s>
              <s>signor Visconte D. </s>
              <s>Giacomo Ruffo, suo camerata ... In pro­
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              posito del moto della luce ha escogitato il sig. </s>
              <s>Dottore una bellissima espe­
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              rienza, per conoscere se questa cammina istantaneamente. </s>
              <s>Pensa egli di ac­
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              comodare molti specchi disposti con quest'ordine, come vede V. S., A, B,
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                <figure id="id.020.01.600.2.jpg" xlink:href="020/01/600/2.jpg" number="80"/>
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            <p type="caption">
              <s>Figura 15
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              C, D.... (fig. </s>
              <s>15) in maniera tale che il raggio del sole
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              da A si rifletta in E, e da E in B ecc. </s>
              <s>ed alla fine da Q
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              di nuovo se ne ritorni in E. </s>
              <s>Certa cosa sarà, se gli spazii
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              da uno specchio all'altro saranno grandi, che potrà asso­
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              lutamente, se la luce non cammina instantaneamente, l'os­
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              servatore posto in E conoscer qualche differenza dall'ap­
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              parire il riflesso di A da quello di
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              Sopra della qual
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              cosa vi ha egli ritrovate alcune belle proposizioni, che io
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              adesso a V. S. significare non posso per la scarsità del
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              tempo. </s>
              <s>Pensa ancora di servirsi di questa esperienza per
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              vedere se veramente sia quella rifrazione nella region va­
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              porosa addotta per causa dagli Astronomi di tante e tante
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              novità contro ogni aspettazione seguite ” (MSS. Gal. </s>
              <s>Disc.,
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              T. CXLIV, c. </s>
              <s>32). </s>
            </p>
            <p type="main">
              <s>Dieci giorni dopo, lo stesso Borelli rendendo conto
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              de'suoi studii al principe Leopoldo, gli descriveva il nuovo
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              modo escogitato per esperimentare la velocità della luce,
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              così concludendo: “ Questa sperienza, come vede V. A. S.,
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              se nel praticarla non s'incontra qualche nuova difficoltà, oltre a quelle che
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              io ho preveduto, è la più squisita che si possa immaginare in questo pro­
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              posito, se io non m'inganno, e però spero questa state, coll'aiuto e favore
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              di V. A. S., poterla mettere in opra, per assicurarmi d'un problema tanto </s>
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