Hi Bob,
There are many "almost" perpetual motion machines in existence.
I personally like the cox clock the best. It works because of the difference in the day and night temperature. But when it was made, no one knew why it worked without any source of power.
There are other hand watches that have come out too now - that require no batteries.
http://www.seikousa.com/Technology/T...technologyId=2
They are too heavy as of now though - but they should get the weight down soon.
And has anyone had a chance to see a long pendulum in - maybe a museum or some other place? They tie a long pendulum (just a string with a ball at the end) to 3rd or 4th floor. And it moves because of the Earth's rotation. And they draw the clock below the pendulum. The closer this pendulum is to the equator, the less it swing length. But its accurate everywhere. You've got to see it to understand it...