08-01-2019, 04:23 PM
This a copy of a post I put on UKVRRR, where they have also discussed the subject. https://www.vintage-radio.net/forum/show...p?t=152927
They have a couple of demonstration sound mirrors in Wat Tyler park Pitsea, Essex.
I went there today for a stroll and we filmed the mirrors.
Here are a couple of photos,
The mirrors are about 100m apart and some thick scrub bushes have grown up between them, masking them so they are difficult to see from each other.
But they do work, if you stand in front of each mirror and talk in a normal voice you can clearly hear one another over the distance of about 100m.
It is quite critical where you listen from, if you move your head forward or backward by more than 6 inches then the sound fades away.
Here is a short demonstration, the video is confusing because Gill could not make out where I was to point the camera. But the audio comes out clearly.
https://www.youtube.com/watch?v=D2tTDYGkiJ8
Mike
They have a couple of demonstration sound mirrors in Wat Tyler park Pitsea, Essex.
I went there today for a stroll and we filmed the mirrors.
Here are a couple of photos,
The mirrors are about 100m apart and some thick scrub bushes have grown up between them, masking them so they are difficult to see from each other.
But they do work, if you stand in front of each mirror and talk in a normal voice you can clearly hear one another over the distance of about 100m.
It is quite critical where you listen from, if you move your head forward or backward by more than 6 inches then the sound fades away.
Here is a short demonstration, the video is confusing because Gill could not make out where I was to point the camera. But the audio comes out clearly.
https://www.youtube.com/watch?v=D2tTDYGkiJ8
Mike
