An article from last October about sound mirrors, and discussion about the various art projects which have made use of them.
From there I found Sound Squad, a school projected linked to Lise Autogena’s Sound Mirrors.
Sound mirrors
Possible Felixstowe sound mirror?
Tom Barrett e-mails to say that at Felixstowe there was a wall type mirror similar to the one at Denge, on a piece of land adjoining the remains of an old fort and martello tower at Felixstowe on the bank of the river Orwell about 1.5 miles upstream from Landgaurd fort. This was a great area for us schoolboys and we were very intrigued when the construction began around 1934. I suspect that it had a very short life as I seem to remember that it had been removed at the time WW2. The area is now completly covered by the Felixstowe container port.
Anyone else know of this?
Marske aerodrome
Perusing a 1963 Ordnance Survey map, I noticed a long-gone bit of railway which I’d never noticed before, running off the Middlesbrough – Saltburn line at Ryehill Farm between Redcar and Marske. A bit of Googling finds references to Marske aerodrome, complete with photos of the sound mirror from 1983.
Plus some more pictures of the Marske mirror
My photos of the Marske mirror
More photos of Abbot’s Cliff
Another photo of the Abbot’s Cliff mirror between Folkestone and Dover, take in June by Hilary who says “Fascinated as we had never seen one before. Now planning to check some others out.” 
Shepway council has a general view of the cliff but the mirror isn’t visible.
Meanwhile, an architect in Seattle e-mails to say An architect friend of mine sent me your link and to tell you the truth, I have found it fascinating. I couldn’t have even imagined anything such as this existing. The structures are unique, reminiscent of some ancient civilizion or culture. I was absolutely intrigued by the construction, form and design of the assemblage.
Mirror humour
Sort-of sound mirror related, but adults only…
There is some discussion in the associated forum about the mathematics of mirror shapes, for those of us who have long-since forgotten the difference between a parabolic curve and an elliptical one.
Kilnsea sound mirror information
Hull Online has some information on the Kilnsea acoustic mirror.
Listening for the enemy
Listening for the Enemy is the title of an article about sound mirrors by Brian Dillon in Cabinet Magazine issue 12, fall/winter 2003/04.
Abbot’s Cliff photo
A dramatic black and white photo of the sound mirror at Abbot’s Cliff looking west, taken recently by Eric Jones.
A sound mirror of your own!
The Selsey acoustic mirror, known locally as the listening post
is up for sale, with a guide price of £120 000 freehold.
Described as Of Non Traditional Construction and Grade II Listed, this property of some historical interest is in need of totally updating.
. From what I remember of my visit, the estate agent’s description is pretty much spot on!
It offers
Kitchen, Sitting Room, Bedroom, Bathroom. There are Surrounding Gardens, a basement ideally used as a workshop and a Garage. Vacant Possession.
Surrounding gardens which are currently overgrown with brambles, enclosed by fencing.
Selsey would be a bit inconvenient for me, and having just bought a house, I’ve no plans to do it all again!
This mirror is rather interesting, in that there is very little information about it floating around. The design is similar to the First World War era mirrors in the northeast. A couple of years ago when I spoke to Richard Scarth, author of Echoes from the Sky he said he’d not been to Selsey to see this one, and didn’t know much about it.
The Selsey Community Website says
The Listening Post was in April 1999 recognised as a Grade 2 Listed building. During the 1st World War a listening post was built in Selsey at East Beach to provide early warning of approaching Zepplins. The structure took the form of an “acoustic mirror” which was built of concrete and shaped like a modern satellite dish. The structure survived and is currently the subject of great interest due to its rarity.
Mirrors from the railway
Last weekend I went down to the 80th anniversary celebrations at the Romney, Hythe & Dymchurch Railway, and in passing confirmed that it is possible to get a distant glimpse of the 200′ listening ear at Denge from a train, if you know where to look.
The Hythe mirror is rather more clearly visible, and is shown in the background of a painting of the RH&DR’s armoured train which is being sold as a postcard.