Jew’s Harp (1880) » musikwissenschaften.de https://musikwissenschaften.de/lexikon/m/maultrommel/jews-harp-1880/
JEW’S HARP, possibly a corruption of Jaw’s harp. In French it is called Guimbarde, and in German Maul–trommel , Mund–harmonika, or Brummeisen (i.e.
The elucidation of this subject is due to the ingenious researches of Professor Wheatstone