One such system was used from 20 December 1938 at the US Navy radio intercept station at Shanghai, to monitor the Moscow-Tokyo diplomatic circuit, using two recorders. In January 1939, this equipment was reported as more successful than automatic recording equipment trialed for the same purpose.
The Telediphone Unit was a transcribing department of the BBC using cylinder and other machines, which produced a typed transcript of (primarily) interview recordings. A recording could be ordered by a producer to be fed to the Unit and after a few days would receive a typed copy.
- Skillen, Hugh (1989). Spies of the Airwaves. pp. 500–501. ISBN 0-9515190-0-X.
- http://www.ibs.org.uk/audiocompendium/index.php?title=Telediphone[permanent dead link]
- Item 153907 of Delia Derbyshire's papers