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...and you would be correct to say audio, seeing that it is a sound locator. it could track slow flying Zeppelins and Gotha bombers at close ranges, just!!!
It could be one of those listening devices that are used to detect oncoming aircraft. We had them in WW2, large concrete structures that focused sound onto a transducer. They were superseded by radar.
Yes the big ones in Kent were, cause they didn't work. Though the army used smaller ones like the one in the photo, until a working gun laying and searchlight aiming radar was developed. The sound locators did lead to a device called an octave filter to cancel out unwanted sounds from non-aircraft noise sources. The device was essentially the first graphic equaliser.
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