


Parallel rule
1876

Parallel rule in bakelite signed `Lund's Rule
1922-1927

Trigonometer serving as protractor and parallel rule
1902-1920

Parallel rule, wood, single parallelogram type

Sliding parallel rule:- 3 foot

Mechanical parallel rule, brass, in pine case

Parallel rule and protractor

Parallel rule
1731-1770

Boswell's parallel rule
1805-1830

Thirteen-arm parallel rule
1840-1860

Field's parallel rule
1876

Parallel rule
1876
Parallel rule
1876
Protracting parallel rule and components
1800-1860
Ivory plotting scale opens to rolling parallel rule and contains dividers and combined pen and pencil
Combined navigational protractor and parallel rule, 1944-1970
1944-1970
Naval parallel rule
1882-1887