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117 to 124 of 227 glossary terms
mater: part of an astrolabe, see article on the astrolabe.
mathematical compendium: compound instrument for performing various functions in practical mathematics.
mathematical instruments: collections of instruments of assorted kinds for performing functions in practical mathematics.
measuring rod: an instrument used to measure distances or depths. See also gauging rod.
measuring rods: see measuring rod.
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.
meridian circle: circular scale of degrees which in use is aligned with the meridian.
mining instruments: in this period mining instruments were principally for surveying, adapted for the special conditions of working underground in mines.
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