25 mars 1857 - Phonautograph was patented.
Description:
A phonautograph is one of the earliest known ways of recording sound. The device was first patented on the 25th of March, 1857. It drew on glass as it received sound. These drawings were the first visual representation of sound.Ajouté au bande de temps:
Date:
25 mars 1857
Maintenaint
~ Il y a 168 ans