Combined eidograph and geometric drawing instrument patented 1858 by William Wythes and made by Queen & Co.
1858-1880
Stanley improved eidograph
1880-1899
Eidograph, Stanley pattern
1870-1900
Selection of three lead weights for eidograph
Eidograph by Stanley
1900-1920
Eidograph, by Alexander Adie; in mahogany box 2'11 1/4" x 7 1/4" x 4"
1823-1834
Eidograph by W.F. Stanley
1865-1876
Early eidograph
Eidograph by W.F. Stanley
1876