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Tonophant
Tonophant Ton"o*phant (t[=o]n"[oasl]*fant), n. [Gr. to`nos a
tone + fai`nein to show.] (Physics.)
A modification of the kaleidophon, for showing composition of
acoustic vibrations. It consists of two thin slips of steel
welded together, their length being adjystable by a screw
socket.
Meaning of Tonophant from wikipedia