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How can we make a wind speed measuring device?
Our anemometer was made from four cups fixed to a wooden cross that could move freely round. The cups were made from the nuts of a calabash tree. The rotating device was connected to a dial that moved with it. The dial rotation was counted using a simple sand clock to get an estimate of relative wind speeds.
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A simple wind vane was constructed to show the direction of the winds. To find north, south, east and west, we used a magnetic compass. Once these directions were known, we attached an arrow to the top of the device and the movement of the pointer gave an indication of wind direction.
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How
do we find out wind direction? 
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