Universal Equinoctial Ring Dial Franklin Mint

It was likely invented by william oughtred around 1600 and became common throughout europe. This is a reproduction of a universal equinoctial ring dial invented by the brilliant english mathematician william oughtred 1575 1660 this ring dial is a sundial that in theory can be used universally to determine the time in almost any part of the world. 16 cm wide 14 cm high has 3 weights.

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