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Inventory no. 76039 - Former Display Label

18th century

Brass. Signed, 'B MARTIN LONDON'; not dated. There are latitude scales for both Northern and Southern latitudes.

The reverse sides of the vertical ring and the hour-ring are calibrated in degrees, so that when the instrument is folded flat, and a plumbline hung from a hole opposite the degree-scale, it may be used as a quadrant.

Lewis Evans Collection

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