Telegraph block instrument (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
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
LicenseTelegraph block instrument; BR
Science Museum Group
© The Board of Trustees of the Science Museum
Telegraph block instrument; BR
Science Museum Group
© The Board of Trustees of the Science Museum
Telegraph block instrument; BR
Science Museum Group
© The Board of Trustees of the Science Museum
Telegraph block instrument; BR
Science Museum Group
© The Board of Trustees of the Science Museum
Telegraph block instrument; BR. Standard modularised 2-needle (2-9)permissive (Down/Up Platform 7A/B; dynataped) 3-position type with a white black-arrowed bakelite wedge as commutator, tapper/blockbell unit underneath, and a plastic case traffolyte-plated "CHESTER No 3A". Known as a 'Penguin'.
