Salusbury, Thomas, Mathematical collections and translations (Tome I), 1667
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            <pb xlink:href="040/01/1018.jpg" pagenum="324"/>
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              <s>For if A be the Center of the Earth,
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              and A N B C D the Spiral Line, having
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              drawn the Right Lines A B, A D, and the
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              like, there is the ſame proportion betwixt
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              the Curved Line A N B and the Right Line
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              AB, as is betwixt the Curved Line A N B C,
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              and the Right Line A C; or betwixt
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              A N B C D and A D: and ſo of the
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              reſt.</s>
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              <s>And if one draw the Tangents D E, C F,
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              and B G, the Angles A D E, A C F, A B G, &c.
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              </s>
              <s>ſhall be equal. </s>
              <s>As for the reſt I will, &c.----</s>
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              <s>Reverend Father,</s>
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              <s>Your very humble Servant</s>
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              <s>
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              DES-CARTES.
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          <chap> </chap>
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