sundial / diptych-dial / compass-dial
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Diptych-dial; ivory with painted decorative pattern surrounding circular dial on lower plate; painted inset table on upper plate: names and latitudes of sixteen towns; inset slider with hole for string gnomon; horizontal string gnomon dial with concentric hour-scales for latitudes 48,45 and 42 degrees, surrounding compass: painted card of compass well set for declination N7E.
- Made in: France
- Length: 72 millimetres
- Width: 58 millimetres
- Height: 15 millimetres
An early example of an adjustable dial.
a. and d. Plain apart from simple rectangular and diagonal markings.
b. A pinted table giving the names and latitudes of sixteen towns of which twelve are in France. Inset, a slider, moving over a scale of degrees marked from 40-50, with a hole through which passes the string gnomon. The outer end of this string is attached to the end of a curved spring inside the edge of the inset, which keeps the string taut.
c. Horizontal string gnomon dial, with concentric hour-scales for latitudes 48°, 45° and 42° surrounding a compass.
The painted card of the compass well is set for declination N7°E.
Prehistory and Europe
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Object reference number: MCC3423
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