George Walker was a versatile English Dissenter, known as a mathematician, theologian, Fellow of the Royal Society, and activist.
George Walker. Stipple engraving by R. Earlom. Wellcome V0006120
Joseph Priestley was an English chemist, Unitarian, natural philosopher, separatist theologian, grammarian, multi-subject educator and classical liberal political theorist. He published over 150 works
Portrait, c. 1797
Priestley's birthplace (since demolished) in Fieldhead, Birstall, West Yorkshire – about six miles (10 km) southwest of Leeds
Mary Priestley, by Carl F. von Breda (1793)
A redacted version of A New Chart of History (1765); Priestley believed this chart would "impress" upon students "a just image of the rise, progress, extent, duration, and contemporary state of all the considerable empires that have ever existed in the world"