Sector by Troughton, brass, engraved "Troughton, London" 12" x 3 1/4" when closed, case 14" x 4 1/2" x 1", "H.O.2." painted on case
This brass sector is a gentleman's instrument dating from the early 19th century. Sectors were used in calculations involving proportion. This instrument contains trigonometrical and navigational scales.
- Object Number:
- British Admiralty (Hydrographic Department)
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