This image is released under a CC BY-NC-SA 4.0 Licence
Buy this image as a print
BuyLicense this image for commercial use at Science and Society Picture Library
LicenseWooden backstaff or Davis quadrant made by James Woodside
Science Museum Group
© The Board of Trustees of the Science Museum
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:
- ebony, boxwood, brass (copper, zinc alloy) and glass
- type:
- back-staff
- credit:
- Mr Evan Roberts
