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| | 121 to 125 of 227 glossary terms |
| 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.
| nautical circle: generic term for a circular mathematical instrument of use in navigation, but likely to carry a range of mathematical and astronomical scales.
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