Wooden backstaff.

Made:
1759 in Tower Hill
maker:
Jno Gilbert, John
Backstaff or Davis quadrant made by John Gilbert, London, 1759. A wooden frame with boxwood arcs and an inlaid boxwood Backstaff or Davis quadrant made by John Gilbert, London, 1759. A wooden frame with boxwood arcs and an inlaid boxwood Backstaff or Davis quadrant made by John Gilbert, London, 1759. A wooden frame with boxwood arcs and an inlaid boxwood Backstaff or Davis quadrant made by John Gilbert, London, 1759. A wooden frame with boxwood arcs and an inlaid boxwood Backstaff or Davis quadrant made by John Gilbert, London, 1759. A wooden frame with boxwood arcs and an inlaid boxwood Backstaff or Davis quadrant made by John Gilbert, London, 1759. A wooden frame with boxwood arcs and an inlaid boxwood

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Backstaff or Davis quadrant made by John Gilbert, London, 1759. A wooden frame with boxwood arcs and an inlaid boxwood
Science Museum Group Collection
© The Board of Trustees of the Science Museum

Backstaff or Davis quadrant made by John Gilbert, London, 1759. A wooden frame with boxwood arcs and an inlaid boxwood
Science Museum Group Collection
© The Board of Trustees of the Science Museum

Backstaff or Davis quadrant made by John Gilbert, London, 1759. A wooden frame with boxwood arcs and an inlaid boxwood
Science Museum Group Collection
© The Board of Trustees of the Science Museum

Backstaff or Davis quadrant made by John Gilbert, London, 1759. A wooden frame with boxwood arcs and an inlaid boxwood
Science Museum Group Collection
© The Board of Trustees of the Science Museum

Backstaff or Davis quadrant made by John Gilbert, London, 1759. A wooden frame with boxwood arcs and an inlaid boxwood
Science Museum Group Collection
© The Board of Trustees of the Science Museum

Backstaff or Davis quadrant made by John Gilbert, London, 1759. A wooden frame with boxwood arcs and an inlaid boxwood
Science Museum Group Collection
© The Board of Trustees of the Science Museum

Wooden backstaff or Davis quadrant made by John Gilbert on Tower, London for Henry Tindall, 26th January, 1759. The navigational instrument is fitted with boxwood circular scales (30°arc 0-25, 60°arc 0-65 & 1’ divisions) on a mahogany frame, a signed inlay wooden plate and decorative stars are stamped on the end of the arcs. The backstaff is incomplete lacking both its vanes.

Details

Category:
Navigation
Object Number:
1912-392
Materials:
boxwood and mahogany
type:
back-staff
taxonomy:
  • furnishing and equipment
  • measuring device - instrument
credit:
Mr. Evan Roberts