What is "tonophant"

Tonophant \Ton"o*phant\ (t[=o]n"[-o]*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 adjustable by a screw socket.

n. (context dated English) A modification of the kaleidophone, for showing the composition of acoustic vibrations. It consists of two thin slips of steel welded together, their length being adjustable by a screw socket.