MIRRORED SOUND

More heritage again today . . .  if I can get it published !

This is an acoustic mirror and our East Coast is fortunate in having three well-preserved ones. I have blipped one in another location on Blip in the past - here.
They were used to give early warning of Zeppelin raids during World War One – an early listening post.
Performed two hard disc scans last night to try and identify my internet problems. Having better luck with BB as long as I do not try and view any extras . . . then back to square one. Beginning to wonder if it is a Blip Error ?