“Forked tube”, Science Teaching Collection
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This kind of fork-shaped tube was used to study the motions of different parts of a vibrating Chladni plate. If the ends of the tube were held over two zones that were vibrating in the same direction, a sound would be heard, but if the vibrations were in opposite directions they would cancel each other out (interfere) and the sound would be greatly reduced.
Source: Steven Turner; Curator, Physical Sciences, National Museum of American History, Smithsonian Institution.
Picture: Steven Turner
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Comparative Musicology
Music and Musicology
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Sound Analysis
Vibration