A sound of film recorder using a photoelectric cell, designed by Ruhmer of Berlin. His photographone, 1904. | |
Lizenzart: | Lizenzpflichtig |
Credit: | Science Photo Library / Universal Images Group / Universal History Archive |
Bildgröße: | 5282 px × 3971 px |
Modell-Rechte: | nicht erforderlich |
Eigentums-Rechte: | nicht erforderlich |
Restrictions: | - |