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Diptych sundial (open)

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made in Dieppe, France

Diptych sundial (open)
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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 open) was made in the 17th century in Dieppe in France. It is unsigned.

The inside of the base has a sunk compass surrounded by a horizontal dial.

This is a form of diptych dial known as a magnetic agimuth dial. This type of dial only works effectively when the Earth's magnetic declination is zero, as was the case for Dieppe in the late 17th century.

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