Author Topic: From the WTF files  (Read 1992 times)

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Offline Richo

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From the WTF files
« on: March 14, 2015, 11:03:27 PM »
Any ideas ?
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Offline fuknKIWI

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Re: From the WTF files
« Reply #1 on: March 14, 2015, 11:24:28 PM »
Half gallon quarter acre Pavlova paradise.

Online Rybags

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Re: From the WTF files
« Reply #2 on: March 15, 2015, 12:24:16 AM »
Some sort of bomb resistant radar?

The Germans attacked English radar sites early in the Battle of Britain but the Poms fixed them fairly quickly and the Germans grossly underestimated their importance and didn't much bother with follow-up attacks.
But maybe one side or the other (or both) tried this sort of thing.  Fairly sure the Germans were using dish type radars fairly early on.

Alternatively, both sides also used directional radio beams for guiding night bombing missions.  The transmitters became prime targets, so maybe these are an effort at fortifying them.

Offline Hardman

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Re: From the WTF files
« Reply #3 on: March 15, 2015, 07:36:00 AM »
:)

Close but no cigar, pre-dates radar, here's your answer :)

http://www.andrewgrantham.co.uk/soundmirrors/

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Offline LordDread

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Re: From the WTF files
« Reply #4 on: March 15, 2015, 10:23:52 AM »
Was gunna say they look like a giant parabolic listening device when i first saw em.

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Re: From the WTF files
« Reply #5 on: March 15, 2015, 01:05:58 PM »
Frig... I knew that.  I'd seen them in a war doco, how they were the somewhat ineffective forerunner to radar.

Offline Hardman

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Re: From the WTF files
« Reply #6 on: March 15, 2015, 07:54:52 PM »
:)

I don't suppose they were ever tested really, I've heard tales that they were instrumental as disinformation to cover the effectiveness of radar during the Battle of Britain, seems reasonable.

It's worth remembering though that even during the Battle radar was not always THAT effective, the classic low avoidance that led to spotters with binoculars and agents near the airfields in France with radios. So, who knows ? Maybe these things did fill in the gap at least a bit.

Radar in 1939 was not exactly the precision tool it is now, all the RAF really wanted to know was if there were a lot of bomb carrying aircraft coming so they could get off the ground and up-sun, I'd guess an acoustic system might have told them that nearly as well, if it was even still in use, given the sheer size and attendant noise of a Luftwaffe raid.

The thing is technology moved so fast there that in a couple of years radar was actually getting to be pretty good.

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Online Rybags

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Re: From the WTF files
« Reply #7 on: March 15, 2015, 08:21:37 PM »
It was probably a mix of sources to credit in early WWII - additional to that, England had the network of reporting and control down to a fine art which would have helped enormously as well.

Cavity magnetron improvements to allow the higher frequency radar as needed for use inside aircraft and to be able to discriminate multiple and smaller targets didn't come on tap until 1940  as well.
Just watching that Australia:  The story of us show on Prime/7 - seems it was an Aussie woman who invented the formula and circuit to allow radar to be able to reject noise and extend useful range to/beyond 100 miles which helped enormously in the Pacific War.

Offline Richo

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Re: From the WTF files
« Reply #8 on: March 15, 2015, 11:59:05 PM »

Very cool Chris.

Apparently the acoustic dishes were not parabolic either. This allowed the microphone placed in front to be moved around and a bearing line taken, triangulated with other dishes and a precise range and heading discovered.

Interesting early tech who's development was killed off by radar.
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Offline LordDread

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Re: From the WTF files
« Reply #9 on: March 18, 2015, 03:16:20 PM »
yup the tech is now just used to snoop on convo's from a fair distance, or stage/performance arts where mics cant be worn

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Re: From the WTF files
« Reply #10 on: March 18, 2015, 04:27:03 PM »
Supposedly there are listening devices where you can just point a laser at a window from hundreds of metres away, and they're good enough to give you audio just from the vibrations from the glass.

Offline Hardman

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Re: From the WTF files
« Reply #11 on: March 18, 2015, 05:23:05 PM »
:)

Indeed there are Ry:

http://en.wikipedia.org/wiki/Laser_microphone

and probably more advanced stuff as well.

Seems like a good reason for double glazing, or, even better, a really neat system that I saw in Boulder Colorado at the airport, double glazing with a system that filled or emptied the gap between the glass with bean bag beads :)

It in the airport made for both a curtain and insulation, also a pretty fascinating effect in motion, all done by the guts of old vacuum cleaners apparently :)

I guess if you want to have a confidential conversation find a room with no windows :)

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Offline Smokey

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Re: From the WTF files
« Reply #12 on: March 18, 2015, 05:57:03 PM »
I read somewhere there is a room so insulated and acousticly quiet that only several moments in it can send one insane.
Opposite to my house that is so noisey it also sends me insane ::p

Offline Hardman

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Re: From the WTF files
« Reply #13 on: March 18, 2015, 06:11:41 PM »
This place Smokey:

http://www.dailymail.co.uk/sciencetech/article-2124581/The-worlds-quietest-place-chamber-Orfield-Laboratories.html

We are not very well attuned to utter silence, it's why despite digital comms being able to be totally silent the telcos put some comfort noise on the call :)

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Offline LogicprObe

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Re: From the WTF files
« Reply #14 on: May 04, 2015, 07:02:49 PM »

Wot!?




Offline Hardman

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Re: From the WTF files
« Reply #15 on: May 04, 2015, 07:06:30 PM »
It was THAT hard to get tickets to the concert ?

 rofl rofl rofl

No idea mate although suspect similar to the sound mirrors except more ear trumpet :)

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Offline Richo

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Re: From the WTF files
« Reply #16 on: May 04, 2015, 08:00:16 PM »
Cool pix Logic, hadn't seen them.


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Online Rybags

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Re: From the WTF files
« Reply #17 on: May 04, 2015, 08:03:59 PM »
Yep, they're cool.  And about the best on offer until radar came along.