09 Mar '12, 6pm

BT Tower 621’ (189metre)# London was supposed not to be noticed being covered by Official Secrets Act. Only the English

BT Tower 621’ (189metre)# London was supposed not to be noticed being covered by Official Secrets Act. Only the English

The tower was conceived in the 1950s when broadband microwave technology seemed the best way serve the growing communication needs of the nation. It was designed to exchange microwave radio signals with other similar towers in locations such as Birmingham, Bristol and Portsmouth. Built in a yard off an existing telephone exchange, it was quite a neat engineering feat. A borehole survey revealed the hard chalk suitable for supporting foundations was 174 feet down, too far to be practically used. Instead an 88 foot square concrete “raft” was placed some 26 feet below street level, supporting a seven metre tall flat topped concrete pyramid, which in turn supported a hollow concrete shaft that forms the core of the tower. Even in 100mph winds it will not sway more than 7.4 inches. Swaying isn’t good for microwave transmission especially in a nuclear holocaust.

Full article: http://cabbieblog.wordpress.com/2011/12/27/londons-top-se...

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