1829 in science

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The year 1829 in science and technology involved some significant events, listed below.

Chemistry

Johann Peter Gustav Lejeune Dirichlet publishes a memoir giving the Dirichlet conditions, showing for which functions the convergence of the Fourier series holds; introducing Dirichlet's test for the convergence of series; the Dirichlet function as an example that not any function is integrable; and, in the proof of the theorem for the Fourier series, the Dirichlet kernel and Dirichlet integral.^[1] He also introduces a general modern concept for a function.^[2]
Nikolai Ivanovich Lobachevsky publishes his work on hyperbolic non-Euclidean geometry.
S. D. Poisson publishes Sur l'attraction des sphéroides.

Jules Desnoyers names the Quaternary period.
Philippe-Charles Schmerling discovers a Neandertal fossil, the partial cranium of a small child.

May - A version of the accordion is patented by Cyrill Demian in Vienna.
June 30 - Henry Robinson Palmer files a British patent application for corrugated iron for use in buildings.^[3]
July 23 - In the United States, William Burt obtains the first patent for a form of typewriter.
October 6–14 - The Rainhill Trials, a steam locomotive competition, are run in England and won by Stephenson's Rocket.
December 19 - Charles Wheatstone patents the concertina in Britain.
Louis Braille publishes the first description of his method of embossed printing that allows the visually impaired to read.^[4]

^ Bressoud, David M. (2007). A radical approach to real analysis (2nd ed.). [Washington, D.C.]: Mathematical Association of America. pp. 218–227. ISBN 978-0883857472.
^ Elstrodt, Jürgen (2007). "The Life and Work of Gustav Lejeune Dirichlet (1805–1859)" (PDF). Clay Mathematics Proceedings 7. http://www.uni-math.gwdg.de/tschinkel/gauss-dirichlet/elstrodt-new.pdf. Retrieved 2011-10-20.
^ Thomson, Nick (2011). Corrugated Iron Buildings. Oxford: Shire Publications. pp. 7–8. ISBN 978-0-74780-783-4.
^ Procédé pour écrire les Paroles, la Musique et le Plain-chant au moyen de points, à l'usage des Aveugles et disposés pour eux. Paris.