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Universal Equinoctian Standing Ring Dial, probably made by Thomas Heath, c. 1730 (brass)
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Universal Equinoctian Standing Ring Dial, probably made by Thomas Heath, c. 1730 (brass)
MFR135758 Universal Equinoctian Standing Ring Dial, probably made by Thomas Heath, c.1730 (brass) by English School, (18th century); height: 36 cm; Private Collection; (add.info.: quadrantal degree scale and an equation of time table enclose a silver compass with a double degree scale and two spirit bubble levels; inner ring is the equinoctial which is engraved with a 24 hour scale and list of latitudes for a further 24 European towns; the bridge carries calendar and zodiac scales for the Julian calendar with sliding double pinhole sights; ); English, out of copyright
Media ID 23198284
© Bridgeman Images
Apparatus Equipment Guide Guiding Longitude Measuring Navigation Navigational
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EDITORS COMMENTS
This photograph showcases a remarkable piece of scientific equipment known as the Universal Equinoctian Standing Ring Dial, believed to have been crafted by Thomas Heath around 1730. Made from brass and standing at a height of 36 cm, this intricate dial is currently held in a private collection. The dial's design features several fascinating elements. A quadrantal degree scale and an equation of time table enclose a silver compass with a double degree scale and two spirit bubble levels. The inner ring represents the equinoctial and is engraved with a 24-hour scale, along with latitudes for 24 European towns. The bridge carries calendar and zodiac scales for the Julian calendar, complete with sliding double pinhole sights. This instrument served multiple purposes, combining measuring tools, navigational aids, and astronomical references into one compact device. Its revolving calibrated plate allowed for precise calculations related to longitude while guiding sailors on their journeys across vast oceans. The Universal Equinoctian Standing Ring Dial exemplifies the ingenuity of its creator during the 18th century. It stands as both an exquisite work of art and an invaluable scientific tool that aided in navigation during an era when exploration was paramount.
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