Photo: Rich Strauss, Smithsonian
Electrotyped copper negative disc of a sound recording, deposited at the Smithsonian in October 1881 in sealed tin box.
Content: Tone; male voice saying: “One, two, three, four, five, six”; two more tones
http://irene.lbl.gov/Smithsonian/Audio/Release/312119_Lateral_Electroplated_Disc-120.wav
2011-03603 – 03612 Copper
