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Azimuth circle

a device for measuring azimuths, consisting of a graduated ring equipped with a sighting vane on each side, which fits concentrically over a compass.
Historical Examples

An arc of the horizon intercepted between the azimuth circle of a celestial object and the magnetic meridian.
The Sailor’s Word-Book William Henry Smyth

The mean of all the readings of the verniers gives the reading on the azimuth circle corresponding to the magnetic meridian.
Encyclopaedia Britannica, 11th Edition, Volume 17, Slice 4 Various


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