Sound mirrors in the Financial Times

An article about sound mirrors by the security and defence editor of the Financial Times.

Forgotten, dilapidated and, in one case, buried by the local council as an eyesore; these smooth, spherical concrete structures known as acoustic mirrors provided the UK with its first early warning system against German air attack during the first world war.

Source: Joe Pettet-Smith’s photographs of the UK’s early warning air defence system, David Bond, Financial Times, 20 July 2018.

It even quotes this website!

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