The phenomenon of the inverse sprinkler can be demonstrated simply by using two or three flexible straws. This experiment throws some doubt on Feynman’s observation of a twisting hose in a carboy by confirming Forrester’s conclusion that an inverse sprinkler will exhibit no motion. The Feynman–Forrester conflict of whether or not forcing water into a sprinkler is the same as if the sprinkler were sucking in water is resolved experimentally in Feynman’s favor.

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