Working History — C. 1970
Ringing machine
This ringing machine was removed from the BT telephone exchange on High Holborn, which is still a functioning digital exchange using System X digital switching. This machine was used in the old pre-digital Strowger exchange to generate tones for telephone calls: dial tone, ring tone, engaged tone.
- Category:
- Working History
- Object ID:
- 2011.5/2
- Object name:
- ringing machine
- Object type:
- Artist/Maker:
- —
- Related people:
- Related events:
- Related places:
- Production date:
- c. 1970
- Material:
metal
- Measurements/duration:
- L 490 mm, W 280 mm, H 235 mm
- Part of:
- —
- On display:
- —
- Record quality:
- 100%
- Part of this object:
- —
- Owner Status & Credit:
Permanent collection
BT Connected Earth
- Copyright holder:
BT
- Image credit:
© BT Heritage
- Creative commons usage:
- —
- License this image:
To license this image for commercial use, please contact the London Museum Picture Library.