Sets of open flutes with internal duct
Sets of open flutes with internal duct without fingerholes combined with set of partly-stopped flutes with internal duct
Mechanically driven sets of open flutes with internal duct without fingerholes
Sets of open flutes with internal duct without fingerholes combined with set of partly-stopped flutes with internal duct with keyboard
Hornbostel - Sachs
Sets of open flutes with internal duct without fingerholes
The air itself is the vibrator in the primary sense. The standing waves are significantly confined within each flute, where a narrow duct directs the air stream against the sharp edge of a lateral orifice. The opposite end is open. Two or more flutes are combined to form a set. The instrument has no fingerholes. Open flue stops of the organ.