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You're correct, however man learned many years ago to harness the power of the wind, water, animal and human power! This post is about making a 'power supply'. I believe that it was an Amish woman...

Way Cool!

I love the belt drive! Reminds me of a lathe that a machinist I worked for back in 1968. You changed speeds by pushing the belts onto various drives, and it was done with your bare hands!