Ernst Ruhmer's Visual Communication 1909
Ernst Ruhmer, German physicist. Demonstrating his experimental possibility of identify the person to whom you were telephoning from London to Paris
Picture No
13808091
Media ID
46784681
Size
8000px x 3932px
(7.8MB)
Credit
© Illustrated London News Ltd/Mary Evans
Source
Photographs by Dr. Alfred Gradenwitz in The Illustrated London News', 13 December 1909, page 886
Date
1909
Pick your License
Anyone Demonstrating Invented Message Optical Possible Telephoning Telephony Transmission Transmissions Transmitting
Features In These Collections
> Contributors > ILN
