Wikipedia
Terpodion
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.
- 1821 one instrument came into London.The Quarterly journal, Band 11, Royal Institution of Great Britain - 1821
Online
- 1821 David Buschmann sold a licence for building terpodions to the instrument builder David Loescham and the cheesemonger James Allwright. Following this, only one instrument was ever built in England.
- 1841 another report could be read in the London newspaper.
Examples of these instruments can be seen in museums all over Europe, including museums in Copenhagen, Leipzig, Vienna, London, Brussels, Stockholm, Jevisovice and Frankfurt/Oder.