Sector by Bion
1700-1720
Silver sector signed by Culpeper
1700-1737
12 inch architectonic sector in ivory and silver
1733-1795
5 1/2-inch ivory sector
A brass sector (Gunter's pattern), early 17th century
1600-1625
Boxwood sector
Sector with scales of chords and equal parts combined with quadrantal protractor or clinometer
1700-1799
Brass sector, by Martel, Geneva
Six inch ivory sector by John Cail
1825-1848
Sector by Thomas Jones
1816-1850
Six inch sector by R.B. Bate, London, 1809-1840.
1809-1840
Wooden sector, radius 4 1/2 inches
4 1/2-inch ivory sector
Brass sector engraved "J.Sisson London"
1722-1783
Gunter type
1620-1700
Brass sector, 6 1/2", French, early example
Wooden sector, radius 4 1/2 inches
Brass sector, by Butterfield
Sector, 6"; brass; engraved "Culpeper Fecit"
1700-1759
Silver sector
1740-1760
Wooden sector, radius 4 1/2 inches
Six inch boxwood sector by Holtzapffel & Co.
Sector by Troughton
1801-1830
Brass sector with decorative endpoints
Sector by Butterfield
1680-1724
Six inch brass sector
Ivory sector by Isaac Carver
1668-1713
Maginnis's universal sector
Surveyor's sector
One 6-inch brass sector for fortification and gunnery
1675-1700
Brass sector to the design of N. Goldman
1723
12 inch brass sector by Potter, Poultry, London
1851-1876
Sector dividing circle and straight line into equal parts
Ivory sector by W. Elliott & Sonst
1850-1853
Sector 6-inch, brass, engraved "M. Berge, London"
1800-1819
Gunmetal sector
Wooden sector, radius 4 1/2 inches
Wooden sector, radius 4 1/2 inches
Wooden sector, radius 4 1/2 inches
Sighting sector/dividers probably Dutch or German
1600-1700
4 1/2 inch boxwood sector by Holtzapffel & Co.
Brass sector with semicircular arc and two folding slit sights
Two ivory sectors by Holtzapffel & Co.
1839-1865
Two sectors by W.F Stanley made respectively of ivory and boxwood
1876
Six identical wooden sectors
1839-1865
Two boxwood sectors by Holtzapffel & Co.
1839-1865
Reproduction of Galileo's brass sector
1965