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Events in telecommunications history

1940

The Private Manual Branch Exchange Switchboard (PMBX)1A was introduced.

The London-Birmingham coaxial cable was extended to Manchester.

On 29 December 1940 the CTO was set on fire by burning debris blown in from adjacent buildings in one of the most destructive German air attacks of the Second World War. A reserve telegraph instrument room had been established in the basement of King Edward Building nearby and, in the longer term, telegraph services were maintained by transferring work to the outskirts of London. The interior of the building was completely destroyed. Its damaged upper floors were unsafe and had to be dismantled. The shell of the ground and first floors was refurbished - the ground floor for office accommodation, and the first for instrument rooms. The new telegraph equipment was opened for service in June 1943.

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