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
Statue of Imhotep, Egypt, 600-500 BCE
600-500 BCE
Excentrolinead, length of ivory scale = 6 inches
1876
Six portable beam heads: 2 plain points
1876
Beam compasses
1876
Opisometer by Elliott Bros.
Three Bennett patent geometric compasses with cases and specimens of work on boards
Farey's centrolinead, with weight, made by W.F.Stanley and Company, London
1876