#AdventuresInHistory!
#OTD #TDIH #April9, 1860 #Phonautograph records history's 1st #AudioRecording.
#EdouardLeonScottDeMartinville #RecordedSound #ScienceHistory #GreatInventions #RecordingHistory #AdventuresInHistory
en.wikipedia.org/wiki/Phonaut...
2
0
1
0