Telegraph block instrument (sending)
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LicenseThis image is released under a CC BY-NC-SA 4.0
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Buy this image as a print
BuyLicense this image for commercial use at Science and Society Picture Library
LicenseThis image is released under a CC BY-NC-SA 4.0
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Buy this image as a print
BuyLicense this image for commercial use at Science and Society Picture Library
LicenseThis image is released under a CC BY-NC-SA 4.0
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Buy this image as a print
BuyLicense this image for commercial use at Science and Society Picture Library
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Telegraph block instrument (sending)
Science Museum Group
© The Board of Trustees of the Science Museum
Telegraph block instrument (sending)
Science Museum Group
© The Board of Trustees of the Science Museum
Telegraph block instrument (sending)
Science Museum Group
© The Board of Trustees of the Science Museum
Telegraph block instrument (sending)
Science Museum Group
© The Board of Trustees of the Science Museum
Telegraph block instrument (sending)
Science Museum Group
© The Board of Trustees of the Science Museum
1994-7275_(0012)
Science Museum Group Collection
Telegraph block instrument; GNR. Pegging/non-pegging absolute 2-needle Down (ivorine)/Up Line (top electrically/bottom mechanically operated) 3-position/3-indication. Has circular indented-edge bakelite-commutator and bell-tapper to RHS; bell-dome assembly is mounted on metal bracket on top of the instrument. The "Train On Line" indication is replaced by "Train Entered Section".
