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Inventory no. 45510 - Former Display Label

early 18th century

Ivory, silver, and gilt and silvered brass; not signed or dated. The pointer on the small circular scale is set to the correct latitude and the small catch depressed, causing the hour-ring to spring up to the appropriate angle. The gnomon is weighted so that it automatically adjusts itself at right-angles to the plane of the hour-ring. To leave room for the spring mechanism the 'southern half' of the compass-needle is replaced by a counter-balance weight near the pivot.

[G 484]
Lewis Evans Collection

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