Sector by Charles Whitwell
1600-11
Six inch brass sector, 1720-1753.
1720-1753
Surveyor's sector, early 17th century
early 17th century
French sector by Canivet,
1751-1774
Brass sector by George Adams, 1756-1760, with fishskin case
1756-1760
Brass sector, engraved "Morgan, London"
1746-1772
One 7 1/2-inch brass sector by Anthonius Hoevenaer
1720-1760
Six inch silver sector, late 18th century.
late 18th century
Boxwood sector (6-inch) by W.F Stanley & Company
1876
Ivory sector (6-inch) by W.F Stanley & Company, Lo
1876
One brass undivided sector
1790-1819
Sector
1780
Brass sector
1758-1769
Sector, brass, (large)
Brass sector, not separated
1790-1819