See Also: phonautograph(medicine)
phonautograph(dictionary)

phonautograph (iou)



phonautograph noun. M19.
[French phonautographe, formed as PHONO- + AUTO-1 + -GRAPH.]
Hist. An apparatus for automatically recording sound vibrations in the form of a tracing on a revolving cylinder.
phonauto'graphic adjective L19.
phonauto'graphically adverb by means of a phonautograph L19.