| Photo #1: June/July, '07: have the basics worked out. This type of whistle is called a Helmholtz Resonator. Critical dimensions are air gap for loudness and resonator cavity length for tone. In this prototype I've made everything adjustable. There's a setscrew I can loosen to move top and bottom segments to maximize volume. I also made a sliding plug with an external indicator (note faint red arrow near bottom) to mark the cut line once various tones have been determined. |
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| Photo #2: Closeup of the business end of the widget. Bottom setscrew removed for volume adjustment. |
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