Slide whistle

A type of duct flute without finger holes. The slide whistle has an extended length of tubing containing a plunger that allows the performer to shorten or lengthen the the resonating length of the tube, thus changing the pitch of the tone produced. The common slide whistle today has a two and one-third octave range in each of two registers. The low register sounds from a low E-flat to a high G and the high register sounds from a low A-flat to a high G. This is also known as song whistle, swanee whistle, piston flute, jazz flute, lotus flute, piston pipe, and bike pump whistle.