12 inch architectonic sector in ivory and silver
1733-1795
Silver sector signed by Culpeper
1700-1737
Sector by Bion
1700-1720
Ivory sector by Isaac Carver
1668-1713
Sector by Butterfield
1680-1724
Sector with scales of chords and equal parts combined with quadrantal protractor or clinometer
1700-1799
Silver sector
1740-1760
Boxwood sector
A brass sector (Gunter's pattern), early 17th century
1600-1625
Six inch ivory sector by John Cail
1825-1848
Maginnis's universal sector
Brass sector, by Butterfield
Brass sector with semicircular arc and two folding slit sights
One 6-inch brass sector for fortification and gunnery
1675-1700
Brass sector, by Martel, Geneva
Sector by Thomas Jones
1816-1850
Six inch brass sector
Sector by Troughton
1801-1830
Sector, 6"; brass; engraved "Culpeper Fecit"
1700-1759
12 inch brass sector by Potter, Poultry, London
1851-1876
Sector 6-inch, brass, engraved "M. Berge, London"
1800-1819
Brass sector with decorative endpoints
Gunter type
1620-1700
Gunmetal sector
Surveyor's sector
Sector dividing circle and straight line into equal parts
Brass sector to the design of N. Goldman
1723
Wooden sector, radius 4 1/2 inches
Wooden sector, radius 4 1/2 inches
Ivory sector, from drawing instrument set
1839-1900
Six inch sector by R.B. Bate, London, 1809-1840.
1809-1840
Brass sector engraved "J.Sisson London"
1722-1783
Six inch boxwood sector by Holtzapffel & Co.
Brass sector, 6 1/2", French, early example
Wooden sector, radius 4 1/2 inches
Wooden sector, radius 4 1/2 inches
4 1/2-inch ivory sector
5 1/2-inch ivory sector
Wooden sector, radius 4 1/2 inches
4 1/2 inch boxwood sector by Holtzapffel & Co.
Wooden sector, radius 4 1/2 inches
Sighting sector/dividers probably Dutch or German
1600-1700
Ivory sector by W. Elliott & Sonst
1850-1853
Reproduction of Galileo's brass sector
1965
Six identical wooden sectors
1839-1865
Boxwood sector, two foot; early example
Sector by Troughton
Brass sector, nine inch, by Adams
Two sectors by W.F Stanley made respectively of ivory and boxwood
1876
Two ivory sectors by Holtzapffel & Co.
1839-1865