Siemen's polarized double recorder, 1870
- Made:
- 1870
- maker:
- William Siemens
This image is released under a CC BY-NC-SA 4.0
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Science Museum Group
© The Board of Trustees of the Science Museum
Siemen's polarized double recorder, 1870
Details
- Category:
- Telecommunications
- Object Number:
- 1876-1298
- type:
- double recorder
- credit:
- H.M. Postmaster General
