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

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            <p type="main">
              <s>
                <pb xlink:href="020/01/320.jpg" pagenum="301"/>
              un regolo orizzontale graduato, come vedesi nella nostra figura 13, imita­
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              tiva di quella stessa, che disegna ivi l'Autore. </s>
            </p>
            <p type="main">
              <s>Intanto, dal sopra allegato testo si rilevano le seguenti importantissime
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                <figure id="id.020.01.320.1.jpg" xlink:href="020/01/320/1.jpg" number="21"/>
              </s>
            </p>
            <p type="caption">
              <s>Figura 13.
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              notizie: Prima, che il Santorio ha ricono­
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              sciuto l'isocronismo del pendolo, così per
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              le ampie che per le più ristrette sue vi­
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              brazioni, assegnando per causa di quel fatto
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              straordinario il principio meccanico delle
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              velocità proporzionali agli spazii. </s>
              <s>Seconda,
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              che i tempi delle vibrazioni fatte da pendoli
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              più o meno lunghi sieno reciprocamente
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              proporzionali alle semplici lunghezze dei fili. </s>
            </p>
            <p type="main">
              <s>Notabile è però che il nostro Santorio,
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              non parla solo del pendolo come misuratore
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              della relativa frequenza e remissione del
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              polso, ma ne parla altresì come di stru­
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              mento assolutamente misuratore del tempo. </s>
              <s>Nella citata pagina 110, insieme
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              con quella nuova disposizione data al Pulsilogio, per allungare o scorciare
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              misuratamente il filo pendulo, vedesi disegnata un'altra figura, a contorno
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              ellittico, nel mezzo della quale son rappresentati due indici, che van no im­
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              perniati nel centro di due archi di cerchio, l'uno maggiore dell'altro, ma
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              graduati ambedue in sette parti, che perciò riescono disuguali. </s>
              <s>La figura
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                <figure id="id.020.01.320.2.jpg" xlink:href="020/01/320/2.jpg" number="22"/>
              </s>
            </p>
            <p type="caption">
              <s>Figura 14.
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              che abbiamo qui ricopiata (fig. </s>
              <s>14) il nostro Autore
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              la illustra colle parole seguenti: “ Figura D est pul­
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              silogium, quod nos adinvenimus, quo non solum
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              tempus sed etiam frequentiam et raritatem pulsus
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              dimetimur. </s>
              <s>In hoc instrumento sunt septem diffe­
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              rentiae frequentioris vel rarioris motus quae per ra­
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              dium observantur: deinde quilibet gradus dividitur
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              in septem minuta quae, per radiolum distinguntur,
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              cuius instrumenti constructionem in libro
                <emph type="italics"/>
              De medicis instrumentis
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              doce­
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              bimus ” (ibi, pag. </s>
              <s>108). </s>
            </p>
            <p type="main">
              <s>Lo strumento così disegnato e descritto dal Santorio non è solo appli­
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              cato all'uso particolare del polso ma a quello generale della misura del
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              tempo, e infatti alla pagina, o diciam meglio alla colonna 486 di questa
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              stessa opera citata, dove descrive l'apparecchio per misurare il calor sensi­
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              bile dei raggi della luna, col Termometro, sopra il bulbo del quale vanno
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              a ferire gli stessi raggi condensati nel fuoco di uno specchio ustorio; si
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              serve, per misurare il tempo dell'azione de'raggi lunari sul bulbo termo­
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              metrico, dello strumento sopra disegnato. </s>
              <s>“ Per instrumentum vero secun­
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              dae figurae temporis spatium dimetimur quod declaravimus folio citato ” (ibi). </s>
            </p>
            <p type="main">
              <s>Non potendosi consultare il Libro degli Strumenti medici, nel quale ci
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              promette l'Autore di descriverci gli organi di questo Misuratore del tempo,
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              nè altrove dicendo nulla di più chiaro, noi non sappiam dire in che modo </s>
            </p>
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