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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