The improved pedometer or waywiser, c 18th century.

The improved pedometer or waywiser, late 18th century.

Pedometer with fob hook, 1775-1794.

Pedometer, early 18th century.

A sketch of a pedometer.

'Improved Paper Mill', 1821.

'Forsyth's Improved Railway Signals'.

Woman's slip, c 1990s.

Henry Booth, British railway pioneer, c 1840s.

The Claxton improved patent ear-cap, 1925-1945.

The Claxton improved patent ear-cap, 1925-1945.

The Claxton improved patent ear-cap, 1925-1945.