|
Date: |
|
Description: | 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. | License: | http://creativecommons.org/licenses/by-nc-sa/2.5/ | Subjects: | back-staff | Temporal: | 1759 | Source: | Science Museum | Creator: | Gilbert, John | Identifier: | 1912-392 | Go to resource |
|
|