A Brass ring sundial
- Period:
- 18th century
- Dimensions:
- 8.5 x 5 x 1.7 cm
- Reference:
- 100-618
€ 1750
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A Brass ring sundial
The instrument consists of a movable central ring with a small aperture (sighting hole), which can be adjusted along a scale marked with the months of the year (I, F, M, A, M, I, I, A, S, O, N, D).
On the inside is a double graduated hour scale, numbered 1–8 and 4–12, arranged along sloping lines that intersect the declination lines.
The following inscriptions are present:‘GNOSVI, IFNAMI.’
The main ring has a slot through which sunlight can enter.
Ring diameter 50 mm × width 17 mm.
Germany, dated 1711.
Ring dials are an old and relatively unusual form of sundial. They operate on the principle that sunlight enters through a small aperture and illuminates the hour markings engraved on the inside of the ring, on the opposite side, thereby indicating the time.
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