Acoustic Mirrors: How to Find Planes without RADAR
A lot of science museums and parks feature something called an acoustic mirror. The one at Houston’s Discovery Green park is called the listening vessels. [Doug Hollis] created two acoustic mirrors 70 feet apart, pointing at each other. If you stand or sit near one of the vessels, you can hear a whisper from someone near the other vessel. The limestone installations (see right) are concave and focus sound like a parabolic mirror will focus light.
Just a science curiosity, right? Maybe today, but not always. The story of these devices runs through World War II and is an object …read more
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