| 摘要 |
The whistle includes a body with at least two chambers formed within the body (2) and each having an open mouth which is located adjacent the open mouth of the other chamber. One of the chambers (4,5) is larger than the other. A mothpiece (3) is attached to the body. At least one open-ended passage extends through the mouthpiece and has an inner open end located adjacent the chamber mouths. A stream of air directed through the passage emerges from the inner end and passes across each open mouth to cause a sound to be generated by each chamber. The sound generated by one chamber is different to that generated by the other. |
