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mathematical compendium: compound instrument for performing various functions in practical mathematics.
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mathematical instruments: collections of instruments of assorted kinds for performing functions in practical mathematics.
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measuring rod: an instrument used to measure distances or depths. See also gauging rod.
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measuring rods: see measuring rod.
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meridian: the plane containing the observer and both celestial poles, or containing the observer, the zenith and the pole, or, more colloquially, the north-south line at a particular position on the earth.
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