Wooden backstaff

Made:
1730; 1967 in Tower Hill
maker:
Science Museum, Workshops
and
John Gilbert
Wooden backstaff Gilbert, John 1730
      Wooden backstaff or Davis quadrant made by John Gilbert on Tower Hill, London,

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Wooden backstaff Gilbert, John 1730 Wooden backstaff or Davis quadrant made by John Gilbert on Tower Hill, London,
Science Museum Group Collection
© The Board of Trustees of the Science Museum

Wooden backstaff or Davis quadrant made by John Gilbert on Tower Hill, London, England in 1730 for Thomas Wells. The navigational instrument is fitted with boxwood circular scales (30°arc 0-25, 60°arc 0-65 & 0.5’ divisions), signed ivory insert and decorative stars are stamped on the frame and arcs. The backstaff is fitted with a replacement Flamsteed Lens and a shadow vane made in the Science Museum workshops in 1967 (copied from Inv. No.1908-158).

Details

Category:
Navigation
Object Number:
1884-18
Materials:
boxwood, glass, ivory and wood (unidentified)
type:
back-staff
taxonomy:
  • furnishing and equipment
  • measuring device - instrument
  • furnishing and equipment
  • vehicle - transportation
credit:
Day, J.