Details
AN ENGLISH HORARY QUADRANT
14TH CENTURY
the copper-alloy plate engraved with six unequal hour lines, a shadow square with two scales each numbered 4 8 12, a quadrant arc 0-90 divided to 1 and numbered [15] 30 45 60 75 [90]
2in. (51mm.) radius

Literature:

Davis, J. 'The Chetwode Quadrant: A Medieval Unequal-Hour Instrument', in Bulletin of the British Sundial Society 27 (2015) pp. 2-6.

Read more about the discovery of the Chetwode Quadrant here.

Discover more about the part this object played in the evolution of the modern PC in our Christie’s Digest feature.
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