Take a close look at the feet on the dude in the middle of the third-to-last picture. What's up with that?
Take a close look at the feet on the dude in the middle of the third-to-last picture. What's up with that?
No pictures from China. In the defense of Chunking, the use of spotters all over the immense countryside gave about 30 minutes' warning. Mark 1 eyeballs.
I have studied WWII and aviation history, and had never seen pictures of those before, nor ever read about them.
Thank you for sharing those pictures!
A good read is "the Invention That Changed the World" by Robert Buderi. It's a book about RADAR; the author interviewed a number of the inventors and people that improved on the technique. He also shows what these scientists did with the technology outside of RADAR.I have studied WWII and aviation history, and had never seen pictures of those before, nor ever read about them.
Thank you for sharing those pictures!
Me either!!
Likewise!!
A good read is "the Invention That Changed the World" by Robert Buderi.
I'm guessing they are different printings of the same book.
Years ago at a science exhibit at Balboa Park in San Diego, they had two huge disks that looked like solid satellite dishes set up about 75 ft apart, facing each other. There was a stairway that would allow you to get to a platform at the back middle of each disk. There was a hole in the middle of the dish so you could hear the sounds the dish picked up. I was on one dish, my girlfriend was on the other. We were able to converse with each other in a normal tone of voice. It was kind of amazing, she sounded like she was right next to me, not 75 ft away in a crowded science hall.
You can do the same thing at the Mitchell Park Domes in Milwaukee, only you're using the entire building - If you stand exactly opposite the center from someone else, you can talk very softly and be heard from quite a distance.
Did you learn that from Dan Brown (The Lost Symbol) or elsewhere?There is a large room (that used to be the House chamber) in the U.S. Capitol building that has an ellipsoidal ceiling, so if you stand at one focus you can whisper to a person quite a distance away located at the other focus.
Did you learn that from Dan Brown (The Lost Symbol) or elsewhere?
It's pretty amazing now, if the opposition shoots a howitzer round, and the system is "on", the satellite tracks the projectile BACK to it's origin, gives co-ordinates, and targets the return round. All before you can get the engine started on the truck.
There have been lots of attempts to use passive acoustics to solve the counter-artillery/mortar/sniper problem, but the propagation problems and time lag have proven nearly insurmountable.
Really? Perhaps not for the same applications you are thinking of, but my understanding is that BBN's boomerang system (http://www.bbn.com/boomerang) has been pretty successful in Iraq. Also, a civilian version, shotspotter (http://www.shotspotter.com/), works pretty well too. My sources are biased 'tho (I know ex-employees of both companies).
Chris
There is a large room (that used to be the House chamber) in the U.S. Capitol building that has an ellipsoidal ceiling, so if you stand at one focus you can whisper to a person quite a distance away located at the other focus.
there is a ceremonial cave in a cliffside at the Bandolier ruins in NM; over 1500 yrs old,
I once heard that the Oval Office had this effect, too, but I can't seem to find any corroboration for that memory right now.Works up in the dome in St. Peter's in the Vatican, as well.
There is a large room (that used to be the House chamber) in the U.S. Capitol building that has an ellipsoidal ceiling, so if you stand at one focus you can whisper to a person quite a distance away located at the other focus.
But it might be Very Good for Truth in Government!It was probably very bad for politics if one focus was in the right wing and the other in the left wing...