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

Table of figures

< >
[Figure 21]
Page: 320
[Figure 22]
Page: 320
[Figure 23]
Page: 321
[Figure 24]
Page: 321
[Figure 25]
Page: 327
[Figure 26]
Page: 332
[Figure 27]
Page: 333
[Figure 28]
Page: 336
[Figure 29]
Page: 341
[Figure 30]
Page: 342
[Figure 31]
Page: 345
[Figure 32]
Page: 348
[Figure 33]
Page: 360
[Figure 34]
Page: 375
[Figure 35]
Page: 380
[Figure 36]
Page: 404
[Figure 37]
Page: 413
[Figure 38]
Page: 413
[Figure 39]
Page: 415
[Figure 40]
Page: 420
[Figure 41]
Page: 421
[Figure 42]
Page: 422
[Figure 43]
Page: 426
[Figure 44]
Page: 427
[Figure 45]
Page: 430
[Figure 46]
Page: 438
[Figure 47]
Page: 439
[Figure 48]
Page: 440
[Figure 49]
Page: 442
[Figure 50]
Page: 456
< >
page |< < of 3504 > >|
    <archimedes>
      <text>
        <body>
          <chap>
            <pb xlink:href="020/01/375.jpg" pagenum="356"/>
            <p type="main">
              <s>
                <emph type="center"/>
              IV.
                <emph.end type="center"/>
              </s>
            </p>
            <p type="main">
              <s>Da quali principii diottrici fosse condotto Galileo in trattar della ra­
                <lb/>
              gione e del modo come si vengono a ingrandire gli oggetti, per opera del
                <lb/>
              Telescopio, si par manifesto da ciò che, in presentar per la prima volta al
                <lb/>
              pubblico il suo nuovo strumento, ne scrisse nel Nunzio Sidereo. </s>
              <s>Preghiamo
                <lb/>
              i nostri lettori ad attender bene alla scienza ottica dalla quale sono infor­
                <lb/>
              mate le parole seguenti: “ Sit enim facilioris intelligentiae gratia, tubus ABCD
                <lb/>
                <figure id="id.020.01.375.1.jpg" xlink:href="020/01/375/1.jpg" number="34"/>
              </s>
            </p>
            <p type="caption">
              <s>Figura 26.
                <lb/>
              (fig. </s>
              <s>26) oculus inspicientis esto
                <lb/>
              E. Radii, dum nulla in tubo ades­
                <lb/>
              sent Perspicilla, ab obiecto FG ad
                <lb/>
              oculum E, secundum lineas rectas
                <lb/>
              FCE, GDE ferrentur: sed, apposi­
                <lb/>
              tis Perspicillis, ferentur secundum
                <lb/>
              lineas refractas HCE, IDE: coar­
                <lb/>
              ctantur enim, et qui prius liberi
                <lb/>
              ad FG obiectum dirigebantur, par­
                <lb/>
              tem tantummodo HI comprehendent ” (Alb. </s>
              <s>III, 62). </s>
            </p>
            <p type="main">
              <s>Che strana teoria del modo di operar del Canocchiale è mai questa? </s>
              <s>
                <lb/>
              Chi così ne discorse, tutt'altro che aver cavato il suo discorso
                <emph type="italics"/>
              dalle più re­
                <lb/>
              condite speculazioni di Prospettiva,
                <emph.end type="italics"/>
              si direbbe che di Prospettiva, ossia di
                <lb/>
              scienza diottrica, non ne aveva nemmeno la prima idea. </s>
              <s>Come mai s'ingran­
                <lb/>
              discono gli oggetti per refrazione coartando i raggi,
                <emph type="italics"/>
              coarctantur enim?
                <emph.end type="italics"/>
              e
                <lb/>
              come posson le lenti mostrare ingranditi gli oggetti, se per l'esempio del­
                <lb/>
              l'Autore non si rappresenta dell'oggetto FG all'occhio altro che una por­
                <lb/>
              zione HI di lui? </s>
            </p>
            <p type="main">
              <s>A svelare il mistero giova intanto sapere esser qui da Galileo profes­
                <lb/>
              sata l'opinione che le lenti mostrino per refrangenza ingrandite le cose,
                <lb/>
              perchè, condensandone i raggi, le rappresentano all'occhio più intensamente
                <lb/>
              illuminate. </s>
              <s>Che poi, per opera delle rifrazioni, facendosi gli stessi raggi di­
                <lb/>
              vergere, si accresca l'angolo visuale, non passa per la mente dell'Autore. </s>
              <s>
                <lb/>
              L'obiettivo per lui opera a quello stesso modo che opera l'oculare, e am­
                <lb/>
              messo, a modo platonico, che le linee radiose muovan dall'occhio per an­
                <lb/>
              dare a incontrar l'oggetto
                <emph type="italics"/>
              (ad obiectum FG dirigebantur),
                <emph.end type="italics"/>
              non sospetta
                <lb/>
              nemmen dalla lontana che i raggi s'incrocino mai in tutto quel tragitto che
                <lb/>
              fanno per venir dall'oggetto lontano ad appuntarsi nell'occhio. </s>
            </p>
            <p type="main">
              <s>Poco dopo aver professate Galileo così fatte dottrine, seppure si meri­
                <lb/>
              tano il nome di dottrine, soggiunge ivi la promessa di dare alla prima oc­
                <lb/>
              casione al pubblico
                <emph type="italics"/>
              absolutam huius Organi theoriam,
                <emph.end type="italics"/>
              e par che questa
                <lb/>
              occasione aspettasse a venir tredici anni dopo, quando dette mano a scri­
                <lb/>
              vere il
                <emph type="italics"/>
              Saggiatore.
                <emph.end type="italics"/>
              Qui si torna a trattar della teoria del
                <gap/>
              </s>
            </p>
          </chap>
        </body>
      </text>
    </archimedes>
Impressum