03/25/1874 Fischer, Henry, (British Telegraph Service) to Barlow, Thomas
(Scudamore, Frank Ives; Eames, J W; Edison, Thomas Alva) Testing and quality control; Automatic telegraphy [Marginalia by Eames, J W Barlow, Thomas]
[Z100]  BT Archives, London, UK: Trials of Thomas Edison's Modification of George Little's Automatic Telegraph System (POST 30/259C)
[Z100EG; TAEM 0:0]
Courtesy of the BT Archives.