The Evolving World of Acoustics and Vibration TechnologiesWhistling pure tone generatorOwned by the Museum for the Science of Sound, Kobayasi Institute of Physical ResearchCourtesy of the Museum for the Science of Sound, Kobayasi Institute of Physical ResearchPhoto by Yuki AkabaAt first glance, the shape of this prod-uct—with its retro overtones—recalls a recorder. Actually, this is a tool used for experiments, referred to as a whistling pure tone generator at the Kobayasi Institute of Physical Research. Its original name has been lost over time. Measur-ing a little under 30 mm in diameter, the cylindrical pipe can be extended to between 20 and 35 cm in length. Blow into the air nozzle at one end; it produces a low-frequency sound that recalls a steam whistle. Like organ pipes, double sirens, and the Edelman pipe, this instrument was created as a sound source for acoustic experiments. Rion is generally regarded as an expert in measuring sound and vibration. Never-theless, without lab sound sources like this, it wouldn’t have been possible for us to achieve our advances in measure-ment technology.The World of Acoustics
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