The Reis Telephone system
The Reis Telephone System (developed by Johann Philipp Reis, 1834 - 1874), demonstrated to the Physical Society in Frankfurt in 1861. Reis speaker worked by magnetostriction
Picture No
13846535
Media ID
45747670
Size
4010px x 3449px
(2.1MB)
Credit
Mary Evans Picture Library
Source
Unattributed engraving
Date
1861
