Mural instrument

（重定向自Mural quadrant）

Mural quadrant constructed as a frame mounted on a wall. This instrument was made by John Bird in 1773 and is in the Museum of the History of Science, University of Oxford.

A Bird Mural Quadrant was for many years the main instrument of the Mannheim Observatory, shown here installed

Ulugh Beg's mural sextant, constructed in Samarkand, Uzbekistan during the 15th century.

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 the meridian. A mural instrument that measured angles from 0 to 90 degrees was called a mural quadrant.

单词	Mural quadrant
释义	Mural quadrant 英语百科 Mural instrument （重定向自Mural quadrant） 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 the meridian. A mural instrument that measured angles from 0 to 90 degrees was called a mural quadrant.
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