Mathematician:D.F. Ferguson

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Mathematician

Calculated approximations to the value of $\pi$ (pi), using a mechanical desk calculator, to:

$620$ digits in $1945$ (or $1946$; sources are inconsistent), finding an error in the work of William Shanks in the $528$th digit
$710$ digits in January $1947$
$808$ digits in September $1947$
$1120$ digits in September $1949$, with John Wrench, using an electro-mechanical calculator.


Sources