A mural instrument is an angle measuring device mounted on or built into a wall. For astronomical purposes, these walls were oriented so they lie precisely on a meridian. A mural instrument that measured angles from 0 to 90 degrees was called a mural quadrant.
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Famous quotes containing the words mural and/or instrument:
“And each of the huge white creatures was huger than fourscore men;
The tops of their ears were feathered, their hands were the claws of birds,
And, shaking the plumes of the grasses and the leaves of the mural glen,
The breathing came from those bodies, long warless, grown whiter than curds.”
—William Butler Yeats (1865–1939)
“We ought, says Kant, to become acquainted with the instrument, before we undertake the work for which it is to be employed; for if the instrument be insufficient, all our trouble will be spent in vain. The plausibility of this suggestion has won for it general assent and admiration.... But the examination can be only carried out by an act of knowledge. To examine this so-called instrument is the same as to know it.”
—Georg Wilhelm Friedrich Hegel (1770–1831)