Proportional compasses by Dollond
Proportional compass
1600-1699
Proportional compasses: 6-inch
1828-1838
Proportional compasses with lineal ratio scale
1900-1920
Proportional compass:- Meeting point pattern
1876
Proportional compasses by Charles Smith
1917
Proportional compasses
Proportional compass
1876
Proportional compass:- Old English
1876
Proportional compass
1843-1844
Proportional compass by Joseph Jackson
1735-1760
Proportional compasses
1720-1753
Proportional compass made by W. F. Stanley
1876
'Whole and Halves' proportional compass by William Ford Stanley
1876
Two proportional compasses in case
Pair of proportional compasses, brass c. 1680
1678-1682
Proportional compass with turn down points
1876