The Joseph Priestley House Museum at Northumberland, Pennsylvania became interested in Priestley's pioneering timelines as a complement to his better known work in chemistry, electricity, biblical scholarship and political radicalism. Boyd Davis wrote this short article for the newsletter published by the Friends of the museum.

The article concentrates on the connections between Priestley, his French contemporary Barbeu-Dubourg and Benjamin Franklin at the time of the struggle for American Independence, and Priestley's two key chronographic innovations: the use of drawn or printed lines to represent the duration of lives, and the associated use of dots to show when the dates of such lives are in doubt or dispute.

Keywords: timeline, chronographics