Important Watches, Collector's Wristw...

Noga Hilton, Geneva, Jun 14, 2003

LOT 134

Unsigned, probably Italian, circa 1660. Exceptionally rare gilt-brass star-form polyhedral sundial.

CHF 5,000 - 7,000

EUR 3,300 - 4,700 / USD 4,000 - 5,400

Sold: CHF 5,290

C. Three-body, hinged base with engraved latitude scale from 25 to 65 degrees, the center part has circular aperture for spring-loaded, spur-shaped hinged latitude setting pointer, the front of the aperture fitted with hinged gnomon frame (missing), the sides of the central part engraved with hour scale, pivoted front cover with center engraved with wind rose and sun-ray motif, the locking part with an eagle with its beak holding the instrument closed.Dim. 72 mm.


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Grading System
Grade: AAA

Excellent

Case: 3-13-14

Good

Slightly damaged

Damaged

Notes

There are a handful of star-shaped sundials known. One, signed "H.F.", is in the British Museum, one is in the Germanisches Museum of uremberg, a 12-point star dial was in the Time Museum collection. In his 1641 treatise on making sundials dialing, Marie Madeleine described a seven-point star dial, although he remarked that the number of points was a matter of choice. In 1708 Welper described a 12-point star dial. A dial with a complicated shape is called polyhedral. Most of them can be used to tell the time from the position of the sun in a number of different ways. Early Renaissance polyhedral dials were made to demonstrate the skill of mathematicians and instrument makers, showing that they had mastered all the new mathematical theories and techniques, while producing a device that actually worked. Later these devices became part of daily life. Sundials work by casting the shadow of a spike called a gn mon onto a series of lines which are calibrated to show the time. Polyhedral sundials showed exactly the same time on all the different faces, no matter what direction the sundial was pointing. Literature: Anthony Turner, Time Museum Catalog.