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Commemorating William Playfair's 250th birthday

Jürgen Symanzik, William Fischetti, Ian Spence
2009 Computational statistics (Zeitschrift)  
We really hope that several traditional commemoratives regarding Playfair, similar to Droesbeke (2009) , will be published in late 2009 and early 2010.  ...  Thus, William was still 12 years old when his father died. Also in the same paragraph, it is stated: "At 21 William Playfair became a draftsman for James Watt."  ... 
doi:10.1007/s00180-009-0170-z fatcat:zaljlpspxjhllikvmjulqx3z2y