Telegraph block instrument (sending), Great Northern Railway
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LicenseTelegraph block instrument (sending), Great Northern Railway
Science Museum Group
© The Board of Trustees of the Science Museum
Science Museum Group Collection
© The Board of Trustees of the Science Museum
Telegraph block instrument; Great Northern Railway. 1-needle 3-position absolute sending type, with wood-handle/rubber-sleeved lever commatator and needle-stops in the lower segment (rather than the GNR norm of upper segment).
