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 * 1) The ballcock in a toilet rises as the water rises, and then it closes a valve that turns off the water. When the water in the toilet rises it knows that if it rises anymore it will spill so that's why the toilet flushes.
 * 1) The fly-ball governor - This was used in controlling the speed of a steam engine. Two balls were attached to a frame and as their rotational speed increased, they swung outward and closed the inlet valve for steam. That caused the engine to slow down.