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Galtona whistle

Galtona a whistle (the English anthropologist and the psychologist of F. Galton, 1822-1911) – the generator of sounds of high frequency (4000-20000 Hz); represents the hollow cylinder having adjustable length into which blow air by means of a rubber barrel; it is used when determining the upper bound of acoustical frequencys which perceives an acoustic organ.

 
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