Astronomical ring with two circles in brass and bronze. The - Lot 126

Lot n° 126
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Estimation :
1000 - 1200 EUR
Astronomical ring with two circles in brass and bronze. The - Lot 126
Astronomical ring with two circles in brass and bronze. The outer ring (meridian circle) suspended from a ring of bélière allows by a rotational movement to adjust this ring according to the latitude of the observation point on a limb ranging from 0° to 90°. The inner ring, representing the equatorial circle, is engraved on the hour dial with Roman numerals. Perpendicularly to this ring is fixed an axis pierced by a light on which can be adjusted according to the date of observation (and thus the declination of the sun) a mobile pinna. Diameter 9 cm. 18th - 19th century. Note: Considered to be the true "primary" watch of sailors, the astronomical ring is also known as the equinoctial or universal ring.
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