Clas 31, clas 47 and a Diesel Multiple Un

Telluric screw of de Chancourtois, c 1862.

Beam engine, 1821.

Two Klein bottles, 1995.

Zenobe Gramme, Belgian electrical engineer, late 19th century.

The improved pedometer or waywiser, late 18th century.

Munsell colour tree, 1970-1971.

Locations used for surveying, 1799.

The second Eddystone lighthouse, Devon, 1708.

Drawing made using a 1909 harmonograph.

Leibniz calculating machine, 1694.

Galvani experiment on frogs' legs, late 18th century.