Dashed left edge = started before February 1823 ·
Dashed right edge = ongoing beyond February 1823
Events in February 1823 1
1759 – 1823William Playfair (1759-1823)Died 11 February 1823, aged 63William Playfair was a Scottish engineer and political economist credited with inventing the statistical line graph, bar chart, and pie chart. His 1786 "Commercial and Political Atlas" introduced data visualization as a tool for economic analysis. His graphical methods laid groundwork still used in charts today.