Telegraph block instrument (absolute/permissive)
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LicenseThis image is released under a CC BY-NC-SA 4.0
Licence
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
Licence
Buy this image as a print
BuyLicense this image for commercial use at Science and Society Picture Library
License
Science Museum Group
©The Board of Trustees of the Science Museum
Telegraph block instrument (absolute/permissive)
Science Museum Group
© The Board of Trustees of the Science Museum
Telegraph block instrument (absolute/permissive)
Science Museum Group
© The Board of Trustees of the Science Museum
Telegraph block instrument (absolute/permissive)
Science Museum Group
© The Board of Trustees of the Science Museum
Telegraph block instrument; LMS (LNWR Fletcher's Style No. 4269). Combined 2-needle permissive pegging/non-pegging 3-position/3-indication. Has circular bakelite-commutator/permissive tell-tale window set in a large brass disc, and at RHS a permissive plunger and blockbell-tapper at bottom RHS (door), with underslung bell-dome. To top window-door RHS, there are 2 embossed-metal 'Absolute/Permissive' flaps, 1 for each needle. Claimed ex BR-Clapham.
