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  1. G

    Question about DC motors

    I've been pondering over this for a while. Is it possible to make a DC motor that does not require a commutater.
  2. G

    Medieval fountains

    Hello, During the middle ages they had fountains, but they didn't have electricity. I tried to recreate one on a smaller scale, but I couldn't figure out how to get the water to pump back up without electricity. Does anyone know how to do this? Thanks.