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
Maginnis's universal sector
A brass sector (Gunter's pattern), early 17th century
1600-1625
Boxwood sector
Six inch ivory sector by John Cail
1825-1848
Sector with scales of chords and equal parts combined with quadrantal protractor or clinometer
1700-1799
Silver sector
1740-1760
Brass sector, by Butterfield
One 6-inch brass sector for fortification and gunnery
1675-1700
Brass sector with semicircular arc and two folding slit sights
Sector 6-inch, brass, engraved "M. Berge, London"
1800-1819
12 inch brass sector by Potter, Poultry, London
1851-1876
Brass sector, by Martel, Geneva
Sector by Thomas Jones
1816-1850
Six inch brass sector
Gunter type
1620-1700
Sector by Troughton
1801-1830
Sector, 6"; brass; engraved "Culpeper Fecit"
1700-1759
Brass sector with decorative endpoints
Surveyor's sector
Gunmetal 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
5 1/2-inch ivory sector
Six inch boxwood sector by Holtzapffel & Co.
Wooden sector, radius 4 1/2 inches
Brass sector, 6 1/2", French, early example
4 1/2-inch ivory sector
Wooden sector, radius 4 1/2 inches
Sighting sector/dividers probably Dutch or German
1600-1700
Wooden sector, radius 4 1/2 inches
Wooden sector, radius 4 1/2 inches
4 1/2 inch boxwood sector by Holtzapffel & Co.
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
Brass sector, nine inch, by Adams
Sector by Troughton
Two sectors by W.F Stanley made respectively of ivory and boxwood
1876
Two ivory sectors by Holtzapffel & Co.
1839-1865