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Davis Quadrant or Backstaff, 1736
William Clarke, London
Maker:
Collectie:
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On the large 30° arc there is a fiducial scale, while the reverse side bears the Sun’s declination table. The graduation on the small 60° arc runs from 0° to 60°, marked at every degree. Along the outer edge an additional scale is provided for correction of the Sun’s semi-diameter.
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A DAVIS QUADRANT OR BACK-STAFF BY WILLIAM CLARKE, 1736
in lignum vitæ with boxwood scales and maker's plate signed and inscribed 'Made by William Clarke near Union Stairs for John Quince 1736'
The arcs divided over one side, the lesser to 60º and the greater to 25º with punched Fleur de Lys and Tudor Rose decoration -- 25in. (63.5cm.) wide
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