Hornbostel - Sachs
Vessel flutes with duct
The air itself is the vibrator in the primary sense. The standing waves are significantly confined within the instrument itself. A narrow duct directs the air stream against the sharp edge of a lateral orifice. The body of the flute is in the form of a vessel, without fingerholes. Zoomorphic pottery whistles (Europe, Asia).
Vessel flutes with duct, without fingerholes