Alexander John Ellis was an English mathematician, philologist and early phonetician who also influenced the field of musicology. He changed his name from his father's name, Sharpe, to his mother's maiden name, Ellis, in 1825 as a condition of receiving significant financial support from a relative on his mother's side. He is buried in Kensal Green Cemetery, London.
Monument, Kensal Green Cemetery
Monument detail, Kensal Green Cemetery
Hermann Ludwig Ferdinand von Helmholtz was a German physicist and physician who made significant contributions in several scientific fields, particularly hydrodynamic stability. The Helmholtz Association, the largest German association of research institutions, is named in his honour.
Hermann von Helmholtz
Helmholtz's polyphonic siren, Hunterian Museum, Glasgow
Helmholtz in 1848
1889 copy of Helmholtz's "Uber die Erhaltung der Kraft", no. 1