02/12/1873 Craig, Daniel H to Scudamore, Frank Ives
(Bain, Alexander; Orton, William) Testing and quality control; Automatic telegraphy [Cover Document and Attachment]
[Z100]  BT Archives, London, UK: Trials of Thomas Edison's Modification of George Little's Automatic Telegraph System (POST 30/259C)
[Z100BO; TAEM 0:0]
Courtesy of the BT Archives.