Blowing the Telegram pipe (1900-1965)

This section of a pneumatic pipe was part of a system used to carry telegrams between the Head Post Office (HPO) in Cardiff and subsidiary post offices. Pipes were laid underground in pairs, one for each direction of transmission, and compressed air generated by a six horse power steam engine propelled the telegrams on their way. In Cardiff, four pairs of tubes terminated in the instrument room at the HPO, two ran to offices in the docks area and another two to a branch office in City Road about half a mile away.