Froude-pattern proportional dividers
1862-1900
Gunner's calliper in electrum and ivory
1816-1850
Glover's sector
1839-1850
Samuel Russell's Patent bi-centrolinead No.24 by Patrick Adie
1848-1886
Tubular beam compasses
1876
Ellipsograph, ebony and electrum
1852-1859
Isograph
1876
Tubular beam compasses - 3 draw; 12" long when closed
1876
2-Foot Rule
1855-1865
Parallel rule
1876
Excentrolinead, length of ivory scale = 6 inches
1876
Six portable beam heads: 2 plain points
1876
Beam compasses
1876
Statue of Imhotep, Egypt, 600-500 BCE
600-500 BCE
Opisometer by Elliott Bros.
Farey's centrolinead, with weight, made by W.F.Stanley and Company, London
1876