05/18/1877 Batchelor, Charles -- Diaries and Journals
(Society of Telegraph Engineers (London); Ward, George G; Preece, William Henry) TAE visitors; Newspapers, books, other publications; Acoustic telegraphy [Document Within a Document]
[MBJ001]  Special Collections Series -- Charles Batchelor Collection -- Journals: Cat. 1233 (1877-1878)
[MBJ001138; TAEM 90:122]
Courtesy of Thomas Edison National Historical Park.