Alec Muffett at Dropsafe on sound mirrors.
Britain is a hothouse of brains and creativity, doubly-so for having to make-do-and-mend from underinvesment and underappreciation, and this leads to startling solutions that fuel incredible innovation – even if most of those subsequently flop for lack of business nous.
Occasionally, these innovations leave footprints in the sand. Bletchley Park is onesuch. Another of which I have long known a little, but never known a lot, are the sound mirrors.