Telegraph block instrument (sending)
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LicenseThis image is released under a CC BY-NC-SA 4.0
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License this image for commercial use at Science and Society Picture Library
LicenseThis image is released under a CC BY-NC-SA 4.0
Licence
License this image for commercial use at Science and Society Picture Library
LicenseThis image is released under a CC BY-NC-SA 4.0
Licence
License this image for commercial use at Science and Society Picture Library
LicenseThis image is released under a CC BY-NC-SA 4.0
Licence
License this image for commercial use at Science and Society Picture Library
LicenseThis image is released under a CC BY-NC-SA 4.0
Licence
License this image for commercial use at Science and Society Picture Library
License
Science Museum Group
© The Board of Trustees of the Science Museum
Science Museum Group
© The Board of Trustees of the Science Museum
Science Museum Group
© The Board of Trustees of the Science Museum
Science Museum Group
© The Board of Trustees of the Science Museum
Science Museum Group
© The Board of Trustees of the Science Museum
Science Museum Group
© The Board of Trustees of the Science Museum
Science Museum Group
© The Board of Trustees of the Science Museum
Telegraph block instrument; BR (MR style). Rotary-pegging 1-needle absolute 3-position/indication, with black-bakelite rotary commutator and 3 brass-plated bakelite push-buttons: "Line Clear"/"Train On Line Cancel" and "BBI (Blocking Back In section) Release".
Details
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