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Woody Nuss:
WW2 era sonic defense system. (not concert audio, but cool)

Nathan Riddle:
This reminds me of the Vortex cannons the Nazis' were trying to build to take down airplanes.

Sent from my XT1585 using Tapatalk

Tim McCulloch:
Interesting. Woody, any other pictures of that device?  It looks like some kind of Cassegrain-derived design.

Kevin Graf:
Doug Self has a page of 48 of these devices.

http://douglas-self.com/MUSEUM/COMMS/ear/ear.htm

John Roberts {JR}:

--- Quote from: Kevin Graf on November 25, 2016, 01:59:19 PM ---Doug Self has a page of 48 of these devices.

http://douglas-self.com/MUSEUM/COMMS/ear/ear.htm

--- End quote ---

here's an older image of a listening device, but not steerable.

JR

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