Older azimuth ring for ship's compass. 20th Century

Older azimuth ring for ship's compass. 20th Century

Azimuth ring in brass with two jaws and a hinged, collapsible sight flap with extended thread. The ring has a false bottom on the underside, allowing it to sit on the edge of a compass bowl, and is used to take readings of landmarks and celestial bodies. Manufacturer unknown. Measurements: approx. 26,5 cm. Condition: missing sighting lens, otherwise see images.