Telegraph relay, Telegraph Works, Silvertown, London c1910-20 Carousel 1

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Description

This brass and mahogany Cylinder Polarised GPO telegraph relay apparatus Numbered 205, was made by "The Telegraph Works, Silvertown, London" c1910 - 20. It is mounted on a large circular base, which has 7 brass "cheese head" terminal screws labelled "U U M T S D D "

Telegraph Relay, (GPO). Relay apparatus is mounted inside an upright metal cylinder. At the top of the cylinder is a circular glass window through which can be viewed the brass face plate a silver-coloured needle arm / switch. At the base of the metal cylinder is an adjustment screw. The cylinder is mounted on a larger circular wooden base which has seven screwing wire connectors labelled "U U M T S D D". Underneath the unit can be seen the insulated wires leading from the wire connectors up into the relay.

Brief History A telecommunications relay such as this was used to amplify signals that are weakened by travelling along long cables. Relays work by activating a sensitive resistance coil which in turn moves electrical contacts at the receiving end. The signal is then amplified using locally powered equipment. This relay is a polarised version meaning its internal componentry contains a permanent magnet. Marks TELEGRAPH WORKS. / SILVERTOWN.LONDON. (Destroyed during "the Blitz"' WWII)