Jan Mari Konstan Duhamel
Date of Birth: 05/02/1797
In 1816 he was admitted to the Ecole Polytechnique, but for political reasons did not finish the course there; for the same reason Duhamel had to leave, and another school (Ecole de droits in Rennes); returning to Paris, he devoted himself mainly pedagogical activity, first as a teacher in secondary schools, and then a tutor and a professor at the Ecole Polytechnique (1834) and professor at the Sorbonne; chair at the school, he left only shortly before his death.
Own their research Duhamel concentrate mainly on mathematical physics; he worked with the French physicists Reno and Savar and famous Fourier, he owns a very complete theory of the bow, and, according to the physics of Jamin, Duhamel is obliged to science first indication of the existence of sounding body together with the main tone additional tones (overtones, harmonics) - discovery, which is usually attributed entirely to Helmholtz. For those of Duhamel was elected in 1840 a member of the Paris Academy on the Poisson space.
The main merit of Duhamel, however, is the significant improvements that have put them in the presentation of infinitely small reason.
In published them in 1840-1841 gg.