Collier's New Encyclopedia (1921)/Mural Circle
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| Edition of 1921; disclaimer. |
MURAL CIRCLE, an astronomical instrument consisting of a graduated circle, furnished with a telescope and firmly affixed to a wall, in the plane of the meridian. It is used for determining with great accuracy altitudes and zenith distances, from which may be found declinations and polar distances, and has a graduated circle secured at right angles to its horizontal axis. See Transit.
