Telegraph block instrument (sending and receiving)
Telegraph block instrument; GWR; Spagnoletti sending and receiving (special) type. 2-vane absolute 3-position/2-indication Up/Down Line (Up line missing its vane-assembly). Circular bakelite commutator, directly above of which is a rectangular brass "Treadle Cleared" window and a circular brass "Tol/Normal/Lc" window. To LHS/RHS respectively, are brass peg/chain mechanisms for "Receive Release/Normal" and "Send Release/Normal", each with a counting-window. Ex Severn Tunnel.