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Sound waves (from voices inside the ambassador's office) passed through the thin wood case, striking the membrane and causing it to vibrate. The movement of the membrane varied the capacitance "seen" by the antenna, which in turn modulated the radio waves that struck and were re-transmitted by the Thing.
The sound is carried by waves, known as whispering-gallery waves, that travel around the circumference clinging to the walls, an effect that was discovered in the whispering gallery of St Paul's Cathedral in London. [1] The extent to which the sound travels at St Paul's can also be judged by clapping in the gallery, which produces four echoes. [2]
Whispering-gallery waves, or whispering-gallery modes, are a type of wave that can travel around a concave surface.Originally discovered for sound waves in the whispering gallery of St Paul's Cathedral, they can exist for light and for other waves, with important applications in nondestructive testing, lasing, cooling and sensing, as well as in astronomy.
An acoustic mirror is a passive device used to reflect and focus (concentrate) sound waves. Parabolic acoustic mirrors are widely used in parabolic microphones to pick up sound from great distances, employed in surveillance and reporting of outdoor sporting events.
A Sound Garden is an outdoor public art work in Seattle, Washington, United States. It is one of six such works on the National Oceanic and Atmospheric Administration (NOAA) campus, which lies adjacent to Warren G. Magnuson Park on the northwestern shore of Lake Washington .
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