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Diptych sundial (closed)

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made in Nuremburg, Germany

Diptych sundial (closed)
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Diptych sundials have two plates hinged together, and in use open out to form a right angle, with the string hinge operating as a gnomon. This ivory example (pictured here closed) was made in 1617, by Lienhart Miler of Nuremburg in Germany.

The photograph shows the outside of the base, which has standard German lunar volvelle in brass. The scales are labelled 1-12 twice (inner) and 1-29 (outer).

A common feature of ivory diptych dials made in Nuremburg and Dieppe was a lunar volvelle to convert the time at night read off a sundial from a shadow cast by moonlight, to the corresponding solar time.

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