Who invented the pie chart?
You might be wondering who invented the pie chart ? (or who invented the pie graph) it was not Florence Nightingale (she published for the first time different types of charts). The Pie chart was invented by William Playfair and was first published in 1801.

Who invented pie chart

Who invented pie chart - zoomed

The above example is included in "The visual display of quantity information" written by Edward R. Tufte

Take Care!
Emil
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