A Flûte Harmonique of 2' or 1' pitch. Audsley describes its tone as �bright ... closely resembling that of the true Flageolet�. Irwin calls it �louder and even rounder than the Flageolet, giving some sense of fullness and �plumpness��.
Flageolet harmonique 2', Positif; St.-Denis, Paris, France; Cavaillé-Coll 1841.