Bell's speaking photo phone vibration of the diaphragm at L caused pulses of light to be transmitted to the receiver, s, which had a light-sensitive selenium cell, and which created a current , so operating the earpiece. 1891
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Image Number: 1746-28992741Rights ManagedCredit Line:World History Archive/Image Asset Management/SuperStockCollection:Image Asset Management Contributor:World History Archive Model Release:NoProperty Release:NoResolution:6994×2998
