Terpodion
![Terpodion Johann David Buschmann (1773-1852) At 1825 Berlin Signatur „J.D. Buschmann in Berlin“ Klaviaturumfang: F2-f4 (six octaves) Restored 2006/07: Andreas Hermert / Meike Wolters, H 830 mm, B 1296 mm, T 666 mm, Inv.-Nr.: V/J 417, Städtische Museen Junge Kunst und Viadrina, 15230 Frankfurt (Oder)](/Images/godic/202502/15/Terpodion_01_gr5315.jpg")
![A Terpodion being played](/Images/godic/202502/15/-Terpodion2.ogv5315.jpg")
![Terpodion Innenansicht, Inv.-Nr.: V/J 417, Städtische Museen Junge Kunst und Viadrina, 15230 Frankfurt (Oder)](/Images/godic/202502/15/Terpodion_02_gr5315.jpg")
![Terpodion Patentzeichnung](/Images/godic/202502/15/Terpodion_03_gr5315.jpg")
The terpodion or uranion is a keyboard instrument which produces sound using the same friction principle as the glass harmonica.
Instead of rotating glass bells a wooden cylinder is rotating. This cylinder is coated with a special mixture. Only 25 instruments were ever built by Christian Friedrich Ludwig Buschmann, the son of Johann David Buschmann, the inventor of this instrument. Johann David Buschmann was first a passementier, then he started repairing key instruments. By 1817 the instrument spanned a range of 5 1/2 octaves.