Agricola, Georgius, De re metallica, 1912/1950
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              as in the case of the suspended plummet level, but is fixed to the instrument in
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              a half-lying position. </s>
              <s>They measure the tunnels for the purpose of knowing
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              how many fathoms they have been increased in elevation; how many fathoms
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              the lower is distant from the upper one; how many fathoms of interval is </s>
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              <s>INDICATOR OF A SUSPENDED PLUMMET LEVEL.</s>
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