Wooden backstaff or Davis quadrant made by John Gilbert on Tower Hill
- Made:
- 1730; 1967 in Tower Hill
- maker:
- John Gilbert and Science Museum, Workshops
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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:
- wood (unidentified), boxwood, ivory and glass
- Measurements:
-
overall: 650 mm x 360 mm x 130 mm,
- type:
- back-staff
- credit:
- Day, J.
