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The Radiometer

A Blast From The Past

photo © Nevit Dilmen
Fun Novelty Gift, The Radiometer
This is an oldie but a goody.  Invented unintentionally in 1873, the inventor turned his science experiment into a novelty toy still sold today. Direct light causes it to turn one way, and cool temperatures cause it to turn the other way.  Read about the science behind the device at Wikipedia 
This is a good gift for kids old enough to safely handle the glass bulb and adults. 
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