Calculating rule by Lenoir in centimetres with conversions

Mathematics

1800-1825

Metal Rule

Aeronautics

Ivory rule

Mathematics

Brass rule used in making planispheres and maps

Mathematics

1808

Metal Rule

Aeronautics

Boxwood rule by W.F. Stanley, arranged by C Hoare,

Meteorology

Boxwood Everard rule signed B. Martin

Mathematics

Mapmaker's quadrilateral rule, boxwood, signed W.H

Mathematics

Section line ruler, in fitted case

Mathematics

Slide rules

James Watt's Garret Workshop

1790-1819