Technology: Acoustics, Ultrasound and Vibration: Historical Acoustics

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Acoustical Detection of Aircrafts http://www.tno.nl/instit/fel/museum/en/airacous.html From the first world war until the 30's air acoustics played an important role in the air defence. As radar was still to be discovered, vision had to be supplemented by hearing using the sound of the engines. (MUSEUM "WAALSDORP": TNO-FEL Museum). Chirped Echo from the Mayan Pyramid of Kukulkan at Chichen Itza http://www.ocasa.org/MayanPyramid.htm David Lubman of the Acoustical Society of America argues that the echo sounds like the primary call of the Mayan sacred bird, the Quetzal. Moving Beyond Prophecies & Predictions http://atlantisrising.com/issue9/ar9beyond.html By Cynthia Gage (Atlantisrising) Rock Art Acoustics http://www.geocities.com/CapeCanaveral/9461/ Steven. J. Waller's Home Page Stone Structures and Sound http://easyweb.easynet.co.uk/~m.judge/stones.htm

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