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Making an anemometer


 

To make an anemometer you will need:

  • a table-tennis ball

  • some fishing line or similar nylon cord

  • a protractor
Anemometer

Thread the table-tennis ball onto the fishing line. Suspend this from the centre of the protractor so that it can swing freely. The fishing line should hang down the 90-degree line on the protractor. An indication of the wind speed will be given by the angle shown on the protractor when the instrument is held in the air. Wind speed readings can be taken at the same time as temperature measurements.