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
- 1986: David Wells: Curious and Interesting Numbers ... (previous) ... (next): $3 \cdotp 14159 \, 26535 \, 89793 \, 23846 \, 26433 \, 83279 \, 50288 \, 41972 \ldots$
- 1997: David Wells: Curious and Interesting Numbers (2nd ed.) ... (previous) ... (next): $3 \cdotp 14159 \, 26535 \, 89793 \, 23846 \, 26433 \, 83279 \, 50288 \, 41971 \ldots$