Source : Webster's Revised Unabridged Dictionary (1913)

Harmoniphon \Har*mon"i*phon\, n. [Gr.? harmony + ? sound.]
   (Mus.)
   An obsolete wind instrument with a keyboard, in which the
   sound, which resembled the oboe, was produced by the
   vibration of thin metallic plates, acted upon by blowing
   through a tube.