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

Table of figures

< >
[Figure 151]
Page: 992
[Figure 152]
Page: 997
[Figure 153]
Page: 1000
[Figure 154]
Page: 1000
[Figure 155]
Page: 1001
[Figure 156]
Page: 1001
[Figure 157]
Page: 1001
[Figure 158]
Page: 1009
[Figure 159]
Page: 1021
[Figure 160]
Page: 1023
[Figure 161]
Page: 1024
[Figure 162]
Page: 1025
[Figure 163]
Page: 1026
[Figure 164]
Page: 1029
[Figure 165]
Page: 1031
[Figure 166]
Page: 1063
[Figure 167]
Page: 1064
[Figure 168]
Page: 1065
[Figure 169]
Page: 1077
[Figure 170]
Page: 1083
[Figure 171]
Page: 1089
[Figure 172]
Page: 1098
[Figure 173]
Page: 1103
[Figure 174]
Page: 1129
[Figure 175]
Page: 1172
[Figure 176]
Page: 1197
[Figure 177]
Page: 1227
[Figure 178]
Page: 1233
[Figure 179]
Page: 1237
[Figure 180]
Page: 1239
< >
page |< < of 3504 > >|
    <archimedes>
      <text>
        <body>
          <chap>
            <p type="main">
              <s>
                <pb xlink:href="020/01/992.jpg" pagenum="435"/>
              primo s'investigano le cause fisiche e meccaniche de'moti; nel secondo si
                <lb/>
              danno le regole per le osservazioni. </s>
              <s>Una delle principali cose che occorre
                <lb/>
              a notare è la conferma e dimostrazione fisica matematica delle Orbite ellit­
                <lb/>
              tiche, dal Montanari ammessa per induzione, e dalla prima Scuola galileiana
                <lb/>
              affatto negata, ed è altresì più notabile che le variazioni e le irregolarità os­
                <lb/>
              servate nei moti le attribuisca l'Autore ai vari modi degl'impulsi radiosi
                <lb/>
              del Sole, o a qualche cosa equivalente insomma all'attrazion neutoniana,
                <lb/>
              ch'egli rende ostensibile con ingegnose esperienze fondate sopra le proprietà
                <lb/>
              del Magnete. </s>
            </p>
            <p type="main">
              <s>Rispetto alle osservazioni, quanto fossero arguti gli avvedimenti del Bo­
                <lb/>
              relli basterebbe a provarlo il cap. </s>
              <s>III del Libro II, dove, in trattar delle va­
                <lb/>
              rietà dell'Ecclissi, dimostra sperimentalmente, con Canocchiali via via di
                <lb/>
              maggiore ingrandimento, come nemmen co'più grandi e più squisiti Stru­
                <lb/>
              menti si arriva a togliere affatto l'irradiazione, cosa che pur sarebbe così
                <lb/>
              necessaria ad avvisar nell'Ecclissi il tempo de'precisi contatti. </s>
            </p>
            <p type="main">
              <s>Altre dottrine di quest'Opera insigne occorrerà di notarle fra poco, e
                <lb/>
              intanto è da saper che a'colloqui vespertini, che si tenevano in Firenze alla
                <lb/>
              presenza del principe Leopoldo, uno de'primi e principali convenutivi era
                <lb/>
              il Viviani. </s>
              <s>A dissertar di Giove e de'Medicei era per lui come un rinfre­
                <lb/>
              scare i più verdi e più gloriosi allori del suo adorato Maestro, nel quale ef­
                <lb/>
              fetto un acuto stimolo di rivalità, oltre al nobile amor della scienza, non gli
                <lb/>
              permetteva, a confronto del Borelli, di mostrarsi inoperoso. </s>
            </p>
            <p type="main">
              <s>Ei non sa però dilungarsi da'metodi praticati da Galileo, e perciò, co­
                <lb/>
              noscendo bene quanto importasse, nelle operazioni micrometriche del suo
                <lb/>
              Maestro, il sapere l'ingrandimento del Canocchiale, ne immaginò, per mi­
                <lb/>
              surarlo più facilmente, questi tre modi: “ Io. </s>
              <s>Sia AB (fig. </s>
              <s>86) una tavoletta
                <lb/>
              tinta di nero, in mezzo di cui sia una striscia bianca uniforme di larghezza,
                <lb/>
              e in mezzo di questa un sottile ago fermato a piombo, sul quale si possano
                <lb/>
                <figure id="id.020.01.992.1.jpg" xlink:href="020/01/992/1.jpg" number="151"/>
              </s>
            </p>
            <p type="caption">
              <s>Figura 86.
                <lb/>
              infilare dei cerchi di cartone tinti
                <lb/>
              neri, i diametri de'quali abbiano
                <lb/>
              nota proporzione con la larghezza
                <lb/>
              della striscia. </s>
              <s>E quivi, infilato or
                <lb/>
              un ed ora un altro de'cerchi, si
                <lb/>
              osservi con l'Occhiale posto a di­
                <lb/>
              rimpetto all'asse qual di loro ap­
                <lb/>
              parirà all'occhio accomodato all'Oc­
                <lb/>
              chiale uguale alla larghezza della
                <lb/>
              fascia vista con l'altro occhio li­
                <lb/>
              bero; che di qui si averà la proporzione dell'ingrandimento. II o. </s>
              <s>Ovvero,
                <lb/>
              prese le distanze de'fochi dell'obiettivo e della lente oculare, quanto quella
                <lb/>
              si troverà maggiore di questa, di tanto l'Occhiale accrescerà ogni larghezza
                <lb/>
              o altezza di oggetto. </s>
              <s>IIIo. </s>
              <s>Ovvero, fatti due cerchi uguali e neri, ed uno os­
                <lb/>
              servato con l'Occhiale nella distanza che si vuole, in campo bianco, l'altro
                <lb/>
              accostisi e discostisi finchè l'occhio libero lo giudichi, nel medesimo campo, </s>
            </p>
          </chap>
        </body>
      </text>
    </archimedes>
Impressum