John Machin was born in 1680.
Arnold Machin died in 1999.
Claude Machin died in 1978.
Henry Machin died in 1918.
Tim N. Machin died in 1915.
William Machin Stairs died on 1865-11-28.
Harold Arthur Clement Machin died in 1931.
Alfred Machin died on June 16, 1929, in Nice, Alpes-Maritimes, France.
He calculated 100 places of pi.
It seems like you may be referring to "Machin's formula," also known as the "Machin-like formulas." These are mathematical formulas that can be used to calculate the value of pi (π) with increased precision. They are named after mathematician John Machin who first developed them in the 18th century.
Alfred Machin's birth name is Eugne Alfred Jean Baptiste Machin.
Arnold Machin was born in 1911.