The earliest known pie chart is generally credited to William Playfair's Statistical Breviary of 1801, in which two such graphs are used.[2][3] This invention was not widely used at first;[2] the French engineer Charles Joseph Minard was one of the first to use it in 1858, in particular in maps where he needs to add information in a third dimension.[22] It has been said that Florence Nightingale invented it, though in fact she just popularised it and she was later assumed to have created it due to the obscurity of Playfair's creation.[23]
(Set your faces to Stunned Bigly, Fri 12 Oct 2012, 11:41, 1 reply, 13 years ago)

I SHALL NEVER TRUST ALAN DAVIES AGAIN

( Monty Boyce, My cheese game is strong, Fri 12 Oct 2012, 11:42, Reply)

You didn't even do the most basic research?

(Set your faces to Stunned Bigly, Fri 12 Oct 2012, 11:43, Reply)

HE SEEMED SO PLAUSIBLE ON THE TELEVISION PROGRAMME

( Monty Boyce, My cheese game is strong, Fri 12 Oct 2012, 11:45, Reply)

IT'S LIKE THOSE CARAVANNING HOLIDAYS WITH 'SIRJIMMEH' ALL OVER AGAIN.

( Monty Boyce, My cheese game is strong, Fri 12 Oct 2012, 11:46, Reply)

You mean 'see what it says on Wikipedia'?

( tangledupinblue hairy badge with moving eyes, Fri 12 Oct 2012, 11:45, Reply)

Like I say
BASIC RESEARCH.
(Set your faces to Stunned Bigly, Fri 12 Oct 2012, 11:48, Reply)