question about homemade wx instruments

When I was in 7th grade I made a home-made sling psychrometer for an Earth Science class. If I can remember right, I just used 2 mercury thermometers that I fastened to a piece of wood with their bottoms exposed to the air. I forget how I made the sling itself though, to spin it around. I do remember getting an A for the project though. :)
 
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