Slide whistle

end-blown wind instrument with a sliding piston to vary the pitch

A slide whistle, also known as a lotus flute, is a type of flute that uses a slide to change the sound from high(loud and squeaky) to low(quiet and dull).[1]

The inside of a slide whistle.
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References

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  1. "slide whistle · Grinnell College Musical Instrument Collection · Grinnell College Libraries". omeka-s.grinnell.edu. Retrieved 2024-04-16.