# Mathematician:Horace Scudder Uhler

## Mathematician

American physicist who worked on geometrical optics, spectroscopy and X-rays.

As a mathematician, demonstrated several Mersenne numbers to be composite without finding one single Mersenne prime.

Also calculated the values of many irrational numbers such as logarithms, reciprocals and roots to a colosssal number of decimal places.

Published the value of $\map {\log_{10} } {9^{9^9} }$ to $250$ decimal places in $1947$.

Apparently he found such work relaxing.

American

## History

• Born: August 5, 1872 in Baltimore, USA
• Died: December 6, 1956

## Publications

• 1907: Atlas of Absorption Spectra