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iPod 1.0

Submitted by Dave on Mon, 02/04/2008 - 4:46pm.
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iPod 1.0

"Amplifiers at Bolling Field, 1921." Two giant horns with ear tubes, evidently designed to listen for approaching aircraft. View full size. National Photo Co.

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Bolling Field

Submitted by Anonymous Tipster on Wed, 04/02/2008 - 2:43pm.

The building in the background is the Army War College at Fort McNair.

 

Can you hear me now?

Submitted by KC on Wed, 02/13/2008 - 6:47pm.

Verizon, the early years.

 

Acoustic Amplifiers

Submitted by Anonymous Tipster on Mon, 02/04/2008 - 7:03pm.

There still exist some of the specially constructed concrete "amplifiers" along the coast of England that were used to listen for approaching aircraft in WW2.

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

 

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