Charles Elwood Mendenhall

Charles Elwood Mendenhall was born on August 1, 1872, in Columbus, Ohio.[1][2] He was the son of Susan Allen (née Marple) and Thomas Corwin Mendenhall.[1][3] At the age of six to nine, he lived in Japan while his father taught at the University of Tokyo.[3] There he became friends with John Morse, son of Edward S. Morse.[3]

He received a Bachelor of Arts in 1894 from Rose Polytechnic in Terra Haute, Indiana.[1][3] Starting in 1895, he studied under Henry Rowland at Johns Hopkins University and received a PhD in 1898.[1][2][4] Under Rowland, he worked with Charles Greeley Abbot, head of the Smithsonian Astrophysical Observatory, and fellow student Frederick A. Saunders, a fellow PhD candidate, on a black-body radiation problem for his thesis.[3]

After graduation from Rose Polytechnic in 1894, Mendenhall worked with George Putnam to make a transcontinental survey of the acceleration of gravity for the U.S. National Geodetic Survey and taught physics for a year at the University of Pennsylvania.[1][3] From 1898 to 1901, he taught at Williams College.[1][3] In 1901, he succeeded fellow Hopkins graduate Robert W. Wood as assistant professor at the University of Wisconsin–Madison.[2][3] He became a full professor in 1905.[1][3][2]

He worked on a 1909 U.S. Mint assay and performed research at the Nela Laboratory in Cleveland in 1913.[3] He is known for inventing the V-wedge method in 1911.[1] In 1917, Mendenhall was made a Major of the Science and Research Division of the U.S. Army Signal Corps.[2][3] He worked closely with his friend Robert Andrews Millikan at the Signal Corps.[3] After World War I in 1919, he transferred to the U.S. Department of State, succeeding Henry A. Bumstead.[3] He served for six months as the scientific attaché at the U.S. Embassy in London.[2][3] He was chairman of the physical science division of the National Research Council in 1919 and 1920.[5]

Mendenhall married Dorothy M. Reed of Talcottville, New York on February 14, 1906. They met as students at Johns Hopkins.[2][3] Together, they had four children, including Margaret, who died shortly after birth, Thomas Corwin Mendenhall and John Talcott Mendenhall.[2][8]

He played the violin and was active in musical circles for much of his life.[3]

Mendenhall died at a hospital in Madison, Wisconsin on August 18, 1935.[1]

• Mendenhall was elected to the United States National Academy of Sciences in 1918.[9]
• In 1935, he was appointed fellow of the American Academy of Arts and Sciences[10] and a member of the American Philosophical Society.[11]
• The Charles Elwood Mendenhall Fellowship is an award given to graduate students working in experimental physics at the University of Wisconsin–Madison.[7]