MICROMETER n.
An instrument, used with a telescope or microscope, for measuring minute distances, or the apparent diameters of objects which subtend minute angles. The measurement given directly is that of the image of the object formed at the focus of the object glass. Circular, or Ring, micrometer, a metallic ring fixed in the foc…
MINUTE a.
. -- Minute book, a book in which written minutes are entered. -- Minute glass, a glass measuring a minute or minutes by the running of sand. -- Minute gun, a discharge of a cannon repeated every minute as a sign of distress or mourning. -- Minute hand, the long hand of a watch or clock, which makes the circuit of…
MOUNTAIN a.
e. -- Mountain barometer, a portable barometer, adapted for safe transportation, used in measuring the heights of mountains. -- Mountain beaver (Zoöl.), the sewellel. -- Mountain blue (Min.), blue carbonate of copper; azurite. -- Mountain cat (Zoöl.), the catamount. See Catamount. -- Mountain chain, a series of co…
MURAL a.
, in the plane of the meridian, attached permanently to a perpendicular wall; -- used for measuring arcs of the meridian. See Circle, n., 3. -- Mural crown (Rom. Antiq.), a golden crown, or circle of gold indented so as to resemble a battlement, bestowed on him who first mounted the wall of a besieged place, and there…