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Sector by Charles Whitwell

Mathematics

1600-11

Brass sector, engraved "Morgan, London"

Mathematics

1746-1772

Surveyor's sector, early 17th century

Mathematics

early 17th century

French sector by Canivet,

Mathematics

1751-1774

Six inch silver sector, late 18th century.

Mathematics

late 18th century

Brass sector by George Adams, 1756-1760

Mathematics

1756-1760

One 7 1/2-inch brass sector

Mathematics

1720-1760

Six inch brass sector, 1720-1753.

Mathematics

1720-1753

Boxwood sector (6-inch) by W.F Stanley & Company,

Mathematics

1876

Ivory sector (6-inch) by W.F Stanley & Company, Lo

Mathematics

1876