Concept 2: The Whistler
Basic Principal: Forced Air Causing Vibration And Sound
How It Works: The user places a blade of grass taut between the two clamping ends. Blowing across the blade of
grass produces a whistling sound.
Ages: 10 and up
Materials: Plastic, Rubber gaskets
Durability: Very durable-No moving parts
One small assembled piece
Safety: Could be a choking hazard for small children (see suggested ages)
Construction Cost: Relatively cheap