Mathematician:James Mark McGinnis Barr
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Mathematician
Electrical engineer, physicist, inventor, and polymath.
Coined the use of $\Phi$ and $\phi$ for the golden mean $1 \cdotp 618 \ldots$ and its reciprocal $0 \cdotp 618 \ldots$ respectively.
Father of Stephen Richie Barr.
Nationality
American (with English citizenship)
History
- Born: 18 May 1871 in Pennsylvania, US
- Died: 15 December 1950 in The Bronx NY, US
Publications
- 1896: The ball race
- 1929: Parameters of beauty
- 1930: The Man and the Turtle
Also known as
Usually known as Mark Barr.