Telegraph block instrument
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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
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Science Museum Group
©The Board of Trustees of the Science Museum
Telegraph block instrument
Science Museum Group
© The Board of Trustees of the Science Museum
Telegraph block instrument
Science Museum Group
© The Board of Trustees of the Science Museum
Telegraph block instrument; BR (LNWR-Fletcher's Style). Combined 2-needle (top-needle present but blanked off) permissive pegging 3-position/3-indication. Traffolyte-plated "Aberdeen Centre". Circular bakelite-commutator/permissive tell-tale window is set in a large brass disc and at RHS is a 'permissive' plunger and a blockbell-tapper at bottom RHS (door) with underslung bell-dome. An unusual "Permissive/Shunt Ahead" flap is attached above the blockbell-tapper.
