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

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              <s>
                <pb xlink:href="020/01/2841.jpg" pagenum="466"/>
              solidum ad suum cylindrum erit subsesquitertium. </s>
              <s>” (pag. </s>
              <s>121, 22). Le quali
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              parole leggendo il Ricci nel settembre del 1644 ringraziava l'Autore dell'aver­
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              gli donato il libro, in cui trovava tutte quelle proposizioni ammirabili, fa­
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              cendogli questa osservazione. </s>
              <s>“ Ho poi veduto citare una proposizione tale:
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                <emph type="italics"/>
              Il solido nato dalla Cicloide, girata intorno una tangente all'asse paral­
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              lela, del suo cilindro è subsesquiterza:
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              cosa dimostrata da me fin da prin­
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              cipio che sentii nominar la Cicloide, e, per la facilità con che si dimostra,
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              non ne ho mai fatta stima veruna. </s>
              <s>” (MSS. Gal. </s>
              <s>Tom. </s>
              <s>XLII, fol. </s>
              <s>50). </s>
            </p>
            <p type="main">
              <s>Non deve averne fatta grande stima nemmeno il Nardi, per cui non
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              pensò di avvertire il Torricelli che il teorema del solido intorno alla tangente
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              parallela all'asse era del Ricci. </s>
              <s>Il sentirsi ora attribuire cosa di sì poco mo­
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              mento, senza far motto del metodo ch'era proprio suo, avuto il quale, il
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              merito del Torricelli non riusciva che secondario; deve essere dispiaciuto al
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              Nardi, il quale però non fece, che da noi si sappia, di ciò lagnanza con nes­
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              suno. </s>
              <s>Rimase perciò nell'animo dello stesso Torricelli dell'ambita invenzione
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              la compiacenza intera, la quale venne nonostante a diminuirsegli da un'altra
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              parte, quando il Mersenno, a proposito della quadratura, gli soggiungeva in
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              una lettera del dì 13 giugno 1644, aver il Roberval da qualche anno dimo­
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              strato che il solido cicloidale intorno alla base sta al cilindro circoscritto
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              come 5 a 8. </s>
            </p>
            <p type="main">
              <s>Se fosse stata dal Matematico parigino ritrovata la proporzione anche
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              fra gli altri solidi il Torricelli era incerto, ma pure si lusingava che no,
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              fermamente credendo che il centro di gravità della Cicloide, e l'applicazione
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              della regola centrobarica, non fosser cose note che a lui. </s>
              <s>Di qui è che al­
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              l'unico teorema annunziatogli dal Mersenno aggiungeva la nota dei parecchi
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              altri da sè dimostrati intorno alle proprietà della cicloide, nella qual nota
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              mandata in Francia parve al Roberval di sentire alitarvi uno spirito di ar­
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              roganza. </s>
              <s>Altre occasìoni s'aggiunser poi ad irritare sempre più gli animi
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              de'due matematici, che finirono per accusarsi obbrobriosamente a vicenda
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              d'usurpazione e di plagio. </s>
              <s>— Ora imparo a credere, scriveva il Torricelli del
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              Roberval, ch'ei non avesse la quadratura della Cicloide,
                <emph type="italics"/>
              ma la prendesse
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              dalla mia.
                <emph.end type="italics"/>
              — E dop'aver minutamente raccontato come passassero le cose
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              fra lui, e quei signori francesi, concludeva, invocando a suo giudice il mondo
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              scientifico:
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              vedete che furto vergognoso hanno tentato di farmi!
                <emph.end type="italics"/>
              </s>
            </p>
            <p type="main">
              <s>Il Roherval di rincontro, descritte l'arti degli invidiosi e degli emuli, da
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              lui rassomigliati ai fuchi, che non sapendo elaborare il dolce miele, inva­
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              dono i favi delle api: “ his artibus, soggiungeva, ipsa trochoides, eiusque
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              tangentes, et plana, sed et solida ferme omnia mihi erepta sunt. </s>
              <s>” (
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              DeTro­
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              choide.
                <emph.end type="italics"/>
              Ouvr. </s>
              <s>cit. </s>
              <s>p. </s>
              <s>343). E perchè non apparisse dubbio essere contro il
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              Torricelli propriamente diretta l'accusa di furto diceva di serbare ancora le
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              lettere di lui: di lui,
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              qui prae caeteris sapere videri volebat,
                <emph.end type="italics"/>
              ed ebbesi al
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              contrario, rispetto al solido intorno l'asse, scoperta la propria ignoranza, d'onde
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              gli nacque nell'animo quella indignazione e quella rabbia! (ivi.) </s>
            </p>
            <p type="main">
              <s>S'ingerirono nella lite avvocati, difensori naturalmente delle ragioni dei </s>
            </p>
          </chap>
        </body>
      </text>
    </archimedes>
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