Christian Gottlieb Kratzenstein
Christian Gottlieb Kratzenstein (30 January 1723, Wernigerode – 6 July 1795, Frederiksberg) was a German-born doctor, physicist and engineer. From 1753 to his death he was a professor in Copenhagen, and became the rector of University of Copenhagen four times.
In 1769 Kratzenstein constructed resonant cavities which, when he excited them by a vibrating reed, produced the sounds of the five vowels: a, e, i, o, and u.
Further reading
- Susan Splinter: Zwischen Nützlichkeit und Nachahmung: eine Biografie des Gelehrten Christian Gottlieb Kratzenstein (1723–1795). Frankfurt (Main): Peter Lang, 2007 ISBN 978-3-631-56958-0
- Sieghard Scheffczyk: "Aus Wernigerode nach Europa – Das bewegte Leben des Christian Gottlieb Kratzenstein". In: Neue Wernigeröder Zeitung; 4, 2011, p. 21
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