Thomas Joseph Heinrich Schellen (1818–84)

German teacher and school director. Began teaching in Cologne, 1841; senior teacher, Dusseldorf, 1842–51. Director of the technical college and Realschule, Münster, 1851–8; director and teacher, higher Bürgerschule (city school), Cologne, 1858–81. Wrote several guides to teaching mathematical and scientific subjects, as well as books for non-specialists on scientific and technical advances.