At 189 metres high, the Post Office Tower literally towered over every other building in the capital when the iconic London landmark now known as the BT Tower opened on this day in 1965.
Built from 13,000 tonnes of steel and 4,600 square meters of glass.
The tower was commissioned by the General Post Office to support microwave aerials carrying telecommunications transmissions from London to the rest of the country.
The tower was designed by architects Eric Bedford and G. R. Yeats, and its cylindrical shape was chosen because it meant that the building would shift no more than 20cm (or one third of a degree) in high winds – a necessity for the aerials it carried.
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