
même sujet
Thomas Alva Edison
Sujet
Edison's voice amplifying machine, c1878. Artist: Unknown
Légende
Edison's voice amplifying machine, c1878. Edison patented a machine to amplify the volume of the human voice in 1878, calling it the 'aerophone'.
Date
1976
Crédit
Photo12/Heritage Images/Keystone Archives
Notre référence
HRM19D70_123
Model release
Non
Licence
Droits gérés
Format disponible
50,0Mo (1,8Mo) / 44,0cm x 28,5cm / 5193 x 3368 (300dpi)