The intent was there would be several microphones that could be triangulated. With a hut full of human computers and sets of trig tables presumably.

The chap mentioned here, Tucke, was active in developing sound artillery ranging, which survived well after WW2. Artillery didn't have the speed issues that killed off sound mirrors before they ever really got going.

Watson Watt and his team fortunately gave us workable radar with height and direction finding by war's outbreak. Just.