Salusbury, Thomas, Mathematical collections and translations (Tome I), 1667

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    <archimedes>
      <text>
        <body>
          <chap>
            <pb xlink:href="040/01/077.jpg" pagenum="61"/>
            <p type="main">
              <s>SALV. </s>
              <s>See here is the glaſſe, which I would have to be placed
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              cloſe to the other. </s>
              <s>But firſt let us go yonder towards the reflection
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              of that flat one, and attentively obſerve its clarity; ſee how
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              bright it is here where it ſhines, and how diſtinctly one may diſcern
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              theſe ſmall unevenneſſes in the Wall.</s>
            </p>
            <p type="main">
              <s>SIMPL. </s>
              <s>I have ſeen and very well obſerved the ſame, now place
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              the other glaſſe by the ſide of the firſt.</s>
            </p>
            <p type="main">
              <s>SALV. </s>
              <s>See where it is. </s>
              <s>It was placed there aſſoon as you
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              gan to look upon the Walls ſmall unevenneſſes, and you
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              ved it not, ſo great was the encreaſe of the light all over the reſt of
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              the Wall. </s>
              <s>Now take away the flat glaſſe. </s>
              <s>Behold now all
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              ction removed, though the great convex glaſſe ſtill remaineth.
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              </s>
              <s>Remove this alſo, and place it there again if you pleaſe, and you
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              ſhall ſee no alteration of light in all the Wall. </s>
              <s>See here then
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              monſtrated to ſenſe, that the reflection of the Sun, made upon a
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              ſpherical convex glaſſe, doth not ſenſibly illuminate the places neer
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              unto it. </s>
              <s>Now what ſay you to this experiment?</s>
            </p>
            <p type="main">
              <s>SIMPL. </s>
              <s>I am afraid that there may be ſome
                <emph type="italics"/>
              Leigerdemain,
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              uſed in this affair; yet in beholding that glaſſe I ſee it dart forth
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              a great ſplendor, which dazleth my eyes; and that which
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              ports moſt of all, I ſee it from what place ſoever I look upon it;
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              and I ſee it go changing ſituation upon the ſuperficies of the glaſſe,
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              which way ſoever I place my ſelf to look upon it; a neceſſary
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              gument, that the light is livelily reflected towards every ſide, and
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              conſequently, as ſtrongly upon all that Wall, as upon my eye.</s>
            </p>
            <p type="main">
              <s>SALV. </s>
              <s>Now you ſee how cautiouſly and reſervedly you ought
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              to proceed in lending your aſſent to that, which diſcourſe alone
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              preſenteth to you. </s>
              <s>There is no doubt but that this which you ſay,
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              carrieth with it probability enough, yet you may ſee, how
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              ble experience proves the contrary.</s>
            </p>
            <p type="main">
              <s>SIMPL. </s>
              <s>How then doth this come to paſs?</s>
            </p>
            <p type="main">
              <s>SALV. </s>
              <s>I will deliver you my thoughts thereof, but I cannot
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              tell how you may be pleaſ'd therewith. </s>
              <s>And firſt, that lively
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              ſplendor which you ſee upon the glaſs, and which you think
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              pieth a good part thereof, is nothing near ſo great, nay is very
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              ceeding ſmall; but its livelineſs occaſioneth in your eye, (by means
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              of the reflection made on the humidity of the extream parts of the
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              eye-brows, which diſtendeth upon the pupil) an adventitious
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              ation, like to that blaze which we think we ſee about the flame of
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              a candle placed at ſome diſtance; or if you will, you may
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              reſemble it to the adventitious ſplendor of a ſtar; for if you ſhould
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                <arrow.to.target n="marg168"/>
                <lb/>
              compare the ſmall body
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              v. </s>
              <s>g.
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              of the
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              Canicula,
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              ſeen in the day time
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              with the
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              Teleſcope,
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              when it is ſeen without ſuch irradiation, with
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              the ſame ſeen by night by the eye it ſelf, you will doubtleſs
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              prehend that being irradiated, it appeareth above a thouſand </s>
            </p>
          </chap>
        </body>
      </text>
    </archimedes>
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