Combined circular and spiral slide rule, in a wooden frame, 1882.

Mathematical instruments, 1747.

Set of mathematical instruments by George Adams, mid 18th century.

Set of buttons engraved with diffraction patterns by John Barton, c 1825.

Navigation slide rule, c 1800.

Navigation slide rule, c 1800.

Rectangular protractor, late 18th century.

Rule, 1750.

Lusuerg protractor, 1701.

Rules and regulations for enginemen, guards and policemen, 1839.

Leadbetter slide rule, c 1700. Leadbetter s

Slide rule, 1815. Made by W Cary. Slide rul