Wooden backstaff.

Made:
1759 in Tower Hill
maker:
Jno Gilbert, John
Wooden backstaff or Davis quadrant made by John Gilbert on Backstaff or Davis quadrant made by John Gilbert, London, 1759 Backstaff or Davis quadrant made by John Gilbert, London, 1759 Backstaff or Davis quadrant made by John Gilbert, London, 1759 Backstaff or Davis quadrant made by John Gilbert, London, 1759 Backstaff or Davis quadrant made by John Gilbert, London, 1759 Backstaff or Davis quadrant made by John Gilbert, London, 1759

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Creative Commons LicenseThis image is released under a CC BY-NC-SA 4.0 Licence

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Creative Commons LicenseThis image is released under a CC BY-NC-SA 4.0 Licence

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Creative Commons LicenseThis image is released under a CC BY-NC-SA 4.0 Licence

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Wooden backstaff or Davis quadrant made by John Gilbert on
Science Museum Group
© The Board of Trustees of the Science Museum

Backstaff or Davis quadrant made by John Gilbert, London, 1759
Science Museum Group Collection
© The Board of Trustees of the Science Museum

Backstaff or Davis quadrant made by John Gilbert, London, 1759
Science Museum Group Collection
© The Board of Trustees of the Science Museum

Backstaff or Davis quadrant made by John Gilbert, London, 1759
Science Museum Group Collection
© The Board of Trustees of the Science Museum

Backstaff or Davis quadrant made by John Gilbert, London, 1759
Science Museum Group Collection
© The Board of Trustees of the Science Museum

Backstaff or Davis quadrant made by John Gilbert, London, 1759
Science Museum Group Collection
© The Board of Trustees of the Science Museum

Backstaff or Davis quadrant made by John Gilbert, London, 1759
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:
mahogany and boxwood
type:
back-staff
credit:
Mr. Evan Roberts