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Events in telecommunications history

1916

The Post Office made the first effective use of amplifiers on telephone circuits when research staff installed experimental repeaters in the London to Belfast and London to Dublin circuits at Liverpool. A few weeks later, the first permanent repeaters were installed in the London to Liverpool cable at Birmingham. The installation of these vacuum tube repeaters was the first commercial use of such equipment.

HMTS Monarch (No. 3) of 1,150 tons joined the Post Office Cableship fleet, remaining in service until being sunk in April 1945 off Southwold, Suffolk. She had already seen damage the previous year in 1944 when she was mistakenly shelled by an American destroyer.

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