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Sector
Sector
Graduations: On upper / lower surface both legs graduated 0-90 inscribed "Sines" "Siysrf?"
On other surface both legs graduated 0-20 and 0-10 inscribed "E Parts"
Each outer edge graduated 10-70. Inner edges 10-100. Folding rule one surface graduated 1-12, 90-0-90, the other surface carries a plane scale. Two square holes at the end of each leg for sights; punched identification marks against each hole. Two threaded holes.
Graduations: On upper / lower surface both legs graduated 0-90 inscribed "Sines" "Siysrf?"
On other surface both legs graduated 0-20 and 0-10 inscribed "E Parts"
Each outer edge graduated 10-70. Inner edges 10-100. Folding rule one surface graduated 1-12, 90-0-90, the other surface carries a plane scale. Two square holes at the end of each leg for sights; punched identification marks against each hole. Two threaded holes.
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Object details
| ID: | NAV0171 |
|---|---|
| Type: | Sector |
| Display location: | Not on display |
| Creator: | Allen, Elias |
| Date made: | circa 1620 |
| Credit: | National Maritime Museum, Greenwich, London |
| Measurements: | Overall: 4 x 225 x 49 mm |