edge tone amplifier

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United States elections portal page linking to each election interactive

A History of U.S. Presidential Elections in Maps

Vincent Van Gogh, Self Portrait. Oil on canvas, 1887.

Rediscovered Artists: 6 Big Names That Time Almost Forgot

An ancient egyptian hieroglyphic painted carving showing the falcon headed god Horus seated on a throne and holding a golden fly whisk. Before him are the Pharoah Seti and the goddess Isis. Interior wall of the temple to Osiris at Abydos, Egypt.

11 Egyptian Gods and Goddesses

Leonardo da Vinci (1452-1519), Italian Renaissance painter from Florence. Engraving by Cosomo Colombini (d. 1812) after a Leonardo self portrait. Ca. 1500.

10 Famous Artworks by Leonardo da Vinci

Groups of depositors in front of the closed American Union Bank, New York City. April 26, 1932. Great Depression run on bank crowd

Causes of the Great Depression

David Cameron. President Barack Obama and Prime Minister David Cameron of the United Kingdom talk during the G8 Summit at the Lough Erne Resort in Enniskillen, Northern Ireland, June 17, 2013

What’s the Difference Between a President and a Prime Minister?

Washington DC.,USA, April 26, 1989. Supporters for and against legal abortion face off during a protest outside the United States Supreme Court Building during Webster V Health Services

Pro and Con: Abortion

edge tone amplifier

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Learn about this topic in these articles:

air pressure

In sound: Variations in air pressure
…to flutes and recorders, an edge tone is a stream of air that strikes a sharp edge, where it creates pressure changes in the air column that propagate down the tube. Reflections of these pressure variations then force the air stream back and forth across the edge, reinforcing the vibration…
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musical properties

In fluidics: Technological developments
Another significant development is the edge tone amplifier, which works very much like a musical instrument; air blown at a sharp wedge oscillates at very high frequencies (about 5,000 hertz) to produce an output that is virtually continuous. Frequency of oscillation (sound) is controlled mechanically or by varying the force…
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