How to make a Whirl Fan

Whirl Fan

Requirements

 - A thin circular tin disk.

 - A pair of scissors or cutters.

 - A knitting needle.

 - Pliers.

 - A cork.

 - A candle.

 - A matchbox.

Procedure

 - Cut teeth in the circumference of the tin disk.

 - Bend the teeth a little for better effects.

 - Bend the knitting needle with the pliers and push in the cork to make a handle.

 - Pivot the toothed wheel on the free end of the needle.

 - Now hold it above a candle flame and see how the wheel revolves.

What do you think, is turning the toothed wheel ?