![]() The graph, then, resembled a cock's comb. Indeed, Nightingale reconfigured the pie chart making the length of the wedges variable instead of their width. įlorence Nightingale may not have invented the pie chart, but she adapted it to make it more readable, which fostered its wide use, still today. Playfair thought that pie charts were in need of a third dimension to add additional information. This invention was not widely used at first. ![]() One of those charts depicted the proportions of the Turkish Empire located in Asia, Europe and Africa before 1789. Playfair presented an illustration, which contained a series of pie charts. ![]() The earliest known pie chart is generally credited to William Playfair's Statistical Breviary of 1801, in which two such graphs are used.
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