Galilei, Galileo, The systems of the world, 1661

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    <archimedes>
      <text>
        <body>
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            <p type="main">
              <s>
                <pb xlink:href="065/01/066.jpg" pagenum="60"/>
              which, without queſtion, the illuminating rayes of the Sun do
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              come; yet nevertheleſſe, it appears not to us bright and ſhining,
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              unleſſe we ſet our eye in that particular place, where the
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              ction arriveth. </s>
              <s>Now let us conſider what would ſucceed, were
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              the glaſſe of a ſpherical figure; for without doubt, we ſhould
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              find, that of the reflection made by the whole ſurface
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              ted, that to be but a very ſmall part, which arriveth to the eye
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              of a particular beholder; by reaſon that that is but an
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              rable particle of the whole ſpherical ſuperficies, the inclination
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              of which caſts the ray to the particular place of the eye; whence
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              the part of the ſpherical ſuperficies, which ſhews it ſelf ſhining
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              to the eye, muſt needs be very ſmall; all the reſt being
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              ſented obſcure. </s>
              <s>So that were the Moon ſmooth, as a
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                <arrow.to.target n="marg167"/>
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              glaſſe, a very ſmall part would be ſeen by any particular eye to
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              be illuſtrated by the Sun, although its whole Hemiſphere were
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              poſed to the Suns rayes; and the reſt would appear to the eye of
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              the beholder as not illuminated, and therefore inviſible; and
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              finally, the whole Moon would be likewiſe inviſible, for ſo much
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              as that particle, whence the reflection ſhould come, by reaſon of
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              its ſmalneſſe and remoteneſſe, would be loſt. </s>
              <s>And as it would be
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              inviſible to the eye, ſo would it not afford any light; for it is
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              together impoſſible, that a bright body ſhould take away our
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              darkneſſe by its ſplendor, and we not to ſee it.</s>
            </p>
            <p type="margin">
              <s>
                <margin.target id="marg167"/>
                <emph type="italics"/>
              The Moon if it
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              were ſmooth, like a
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              ſpherical glaſſe,
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              would be inviſible.
                <emph.end type="italics"/>
              </s>
            </p>
            <p type="main">
              <s>SALV. </s>
              <s>Stay good
                <emph type="italics"/>
              Sagredus,
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              for I ſee ſome emotions in
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              the face and eyes of
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              Simplicius,
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              which are to me as indices that
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              he is not either very apprehenſive of, or ſatisfied with this which
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              you, with admirable proof, and abſolute truth have ſpoken.
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              </s>
              <s>And yet I now call to mind, that I can by another experiment
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              remove all ſcruple. </s>
              <s>I have ſeen above in a Chamber, a great
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              ſpherical Looking-glaſſe; let us ſend for it hither, and whileſt it
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              is in bringing, let
                <emph type="italics"/>
              Simplicius
                <emph.end type="italics"/>
              return to conſider, how great the
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              clarity is which cometh to the Wall here, under the penthouſe,
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              from the reflection of the flat glaſſe.</s>
            </p>
            <p type="main">
              <s>SIMPL. </s>
              <s>I ſee it is little leſſe ſhining, than if the Sun had
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              rectly beat upon it.</s>
            </p>
            <p type="main">
              <s>SALV. </s>
              <s>So indeed it is. </s>
              <s>Now tell me, if taking away that ſmall
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              flat glaſſe, we ſhould put that great ſpherical one in the ſame
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              place, what effect (think you) would its reflection have upon the
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              ſame Wall?</s>
            </p>
            <p type="main">
              <s>
                <emph type="italics"/>
              S
                <emph.end type="italics"/>
              IMPL. </s>
              <s>I believe that it would eject upon it a far greater and
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              more diffuſed light.</s>
            </p>
            <p type="main">
              <s>
                <emph type="italics"/>
              S
                <emph.end type="italics"/>
              ALV. </s>
              <s>But if the illumination ſhould be nothing, or ſo
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              ſmall, that you would ſcarſe diſcern it, what would you ſay
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              then?</s>
            </p>
            <p type="main">
              <s>
                <emph type="italics"/>
              S
                <emph.end type="italics"/>
              IMPL. </s>
              <s>When I have ſeen the effect, I will bethink my ſelf
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              of an anſwer.</s>
            </p>
          </chap>
        </body>
      </text>
    </archimedes>
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