Wooden backstaff.

Made:
1733 in Dublin
maker:
James Woodside

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Wooden backstaff or Davis quadrant made by James Woodside, Dublin, Ireland, 1733. The navigational instrument is fitted with boxwood circular scales (30°arc 0-25, 60°arc 0-65 & 1.5’ divisions) on an ebony frame with signed central strut, a Flamsteed Lens, two signing vanes with brass retaining pressure clips and brass rivets with diamond-shaped caps.

Details

Category:
Astronomy
Object Number:
1912-393
Materials:
boxwood, brass (copper, zinc alloy), ebony and glass
type:
back-staff
taxonomy:
  • furnishing and equipment
  • measuring device - instrument
credit:
Mr Evan Roberts