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