Sector by Charles Whitwell
1600-11
Boxwood sector (6-inch) by W.F Stanley & Company
1876
French sector by Canivet,
1751-1774
Brass sector by George Adams, 1756-1760, with fishskin case
1756-1760
Ivory sector (6-inch) by W.F Stanley & Company, Lo
1876
Surveyor's sector, early 17th century
early 17th century
Six inch brass sector, 1720-1753.
1720-1753
Six inch silver sector, late 18th century.
late 18th century
Brass sector, engraved "Morgan, London"
1746-1772
One 7 1/2-inch brass sector by Anthonius Hoevenaer
1720-1760
Sector, marked 'EAF'
Sector
1780