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Make your own Anemometer
You will need:
-
30cm of strong thread or fishing line
- a ping pong or other small, light, plastic ball
- Glue and sellotape
- a protractor
- A piece of strong cardboard
What to do:
- Stick the protractor to the cardboard with sellotape, with the straight side at the top
- Write the following wind conversion chart onto the cardboard as well:
| string angle |
90 |
80 |
70 |
60 |
50 |
40 |
30 |
20 |
| wind speed (km/hour) |
0 |
13 |
19 |
24 |
29 |
34 |
41 |
52 |
- Attach the thread to the ping pong ball
- Tie or glue the other end of the thread to the centre of the protractor
- Hold the cardboard in the direction that the wind is blowing, allowing the ball to be caught by the wind.
- Convert the angle the thread makes to a wind speed using the conversion chart
- If you have one, compare your readings to those made with a
'real' anemometer - how does it compare? Otherwise, compare your
readings with the Beaufort Scale
| 
