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30-10-2007, 07:18 AM
| #1 (permalink) |
| Super Moderator   Join Date: Sep 2007 Location: Melbourne Australia
Posts: 3,183
You're Top Poster: #3   | Sound Mirrors - Pre War An interesting site showing what was in use before radar. I have never seen or heard of these. There was also a bigger one set up in Malta. http://www.ajg41.clara.co.uk/mirrors/index.html
__________________ Spidge, ------------------------------------------------------- My Avatar is the memorial to the 22 Commonwealth Coastwatchers at the Temakin Cemetery on Betio (Tarawa Atoll) who were beheaded by the Japanese on 15th October 1942. http://www.dva.gov.au/media/publicat...mem_beito.html "You were given the choice between war and dishonor. You chose dishonor and you will have war." (Winston Churchill made this prophetic pronouncement in a House of Commons speech in 1938, just after Prime Minister Neville Chamberlain signed the Munich agreement with Hitler. Chamberlain returned from Germany with the signed agreement in hand, proclaiming that "peace in our time" had been achieved. Churchill attacked Chamberlain's "politics of appeasement" in this and many other speeches.) What did the Australians do in ww2 and other conflicts? Check out this site: http://www.diggerhistory.info/00-pag...ster-index.htm |
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30-10-2007, 07:35 PM
| #2 (permalink) |
| Kneel before Mod  Join Date: Sep 2007
Posts: 1,521
You're Top Poster: #4  | I saw these on Map Man a couple of years ago. One still stands in the marshes of the Wash (I think) in the centre of a nature reserve. Listed structures all of them. i think there were a couple of mirrors and a large arced wall too. They actually tested them and it did enable them to hear a Tiger Moth coming before seeing or hearing it naturally. Quite simple things. But Watson Watt came along and they became history.
__________________ "Time is a great storyteller" If my calculations are correct SLINKY + ESCALATOR = EVERLASTING FUN God is the experience of looking at a tree and saying, "Ah!" - Joseph Campbell |
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30-10-2007, 11:35 PM
| #3 (permalink) |
| Senior Member  Join Date: Sep 2007 Location: West Wickham, Kent
Posts: 389
You're Top Poster: #10  | A slightly better picture than the one on the link, of the Sound mirror at Kilnsea in Yorkshire, dating from 1917. They had some degree of usefulness in 1917-18, providing the enemy conveniently flew within a few miles of the mirror (we're talking aeroplane bombers not airships by this time), and prviding there was no background noise (so they were situated in isolated areas). The pole just visible in from the bowl held a microphone, which was pointed at the part of the mirror which gave the loudest sound and hence the direction of the enemy could be calculated (roughly). But sound-waves travel very considerably slower than light or radio (electro-magnetic) waves, so any usefulness the mirrors had against Gothas traveling at 90 mph, giving maybe 20 minutes or so for the Home Defence fighters to intercept, had dissappeared by the time of WW2 when the enemy was travelling at 250mph, giving maybe four minutes warning. |
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31-10-2007, 12:00 AM
| #4 (permalink) | |
| Super Moderator Join Date: Sep 2007 Location: Melbourne Australia
Posts: 3,183
You're Top Poster: #3 | Quote:
__________________ Spidge, ------------------------------------------------------- My Avatar is the memorial to the 22 Commonwealth Coastwatchers at the Temakin Cemetery on Betio (Tarawa Atoll) who were beheaded by the Japanese on 15th October 1942. http://www.dva.gov.au/media/publicat...mem_beito.html "You were given the choice between war and dishonor. You chose dishonor and you will have war." (Winston Churchill made this prophetic pronouncement in a House of Commons speech in 1938, just after Prime Minister Neville Chamberlain signed the Munich agreement with Hitler. Chamberlain returned from Germany with the signed agreement in hand, proclaiming that "peace in our time" had been achieved. Churchill attacked Chamberlain's "politics of appeasement" in this and many other speeches.) What did the Australians do in ww2 and other conflicts? Check out this site: http://www.diggerhistory.info/00-pag...ster-index.htm | |
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04-11-2007, 07:13 PM
| #5 (permalink) |
| Super Moderator  Join Date: Sep 2007 Location: Wishaw, Lanarkshire
Posts: 1,106
You're Top Poster: #5  | Not only were there giant sound mirrors, but there was a smaller sound locator. Here is a photo of one in action and is taken from the book, Military Science Today By Lt Col Donald Portway RE from 1940
__________________ WWW.Warfaretoday.com HSL130 picking up the crew of a downed Halifax  Et tantis pretis constitutis plures Macropodidas in hae caupona minime videbis |
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21-11-2007, 10:13 AM
| #6 (permalink) |
| Άρης  Join Date: Sep 2007 Location: Terra something or other
Posts: 4,930
You're Top Poster: #1 | I can't find any actual details for this picture but I bet he suffered from headaches!
__________________ _________________  Beaufighter TF Mark Xs (NV427 'EO-L' nearest) of No. 404 Squadron RCAF based at Dallachy, Morayshire, breaking formation during a flight along the Scottish coast. February 1945. Last edited by Kyt; 21-11-2007 at 10:15 AM. |
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