Molecular models for demonstration to the visually impaired, 20th century.

Burroughs registering accountant, c 1900.

Anatomical model of a human head, Europe, 1801-1900.

David Edward Hughes, English electrician and inventor, c 1880s.

A pioneering ball and stick atomic model set, 1860s.

Model of human eye, by Louis Thomas Jérôme, France, 1870.

Model of an eye, Europe, 1601-1700.

Diagrams of the eye showing perfect, long and short sight.

Model of human eye, French, c 1870.

Murphy-type chloroform inhaler, Europe, 1850-1900

Hand folding 'scisor' type spectacles with gilt frame, French, 1800-1830.

Demonstration model of Babbage's Difference Engine No 1, 19th century.