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Hand-made musical instruments

• What determines the musical scale?
  We explain the priciple in our book ";Lively Physics and Exciting Experiments";
  I would like to let all students make instruments by their own hands.
  Making many holes around a juice can, you rotate it with a motor.
  When you blow the holes through a straw, you hear some sound at a certain pitch.
• If you make some sets of holes, you get a musical scale.
  Let's enjoy the musical instrument of siren type.

Preparation

1. After enlarging the figurein which many cross marks are printed, you stick it on the side of a can with sticky tape.
2. You make little holes at the centers of crosses with a thumbtack.
3. You enlarge the holes with a short nail.
4. You enlarge the holes with a long nail besides.
5. You connect the spindle of the can with the shaft of a motor by a pipe.
6. You put a battery into a battery case and connect the motor by leading cords.

How to play

1. When you switch on the motor, the can begins to turn.
2. Blow the holes through a straw. When you blow the holes at right angle to the side of the can, you can enjoy good sounds.

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