New Demo!! Take two Orings, one of which is just small enough to fit inside the other with a bit of space around it (not a lot!) Mark the inner ring with a dot of whiteout or other visible mark. With them on a flat surface, move the outer ring in a small circle (do not rotate the ring, oscillate it so it scoots in a small circle. The inner ring will actually rotate! (opposite of the oscillation direction!) The direction depends on the harmonics of your engine and the mounting of the holder. In a different location, it might rotate the other direction. Move the outer ring in an oscillation the other direction and it will rotate the inner ring the other direction. An added ounce of very soft rubber on the outside of the holder (that could absorb the vibration) might stop it! As would a notch in the holder, and a "key" glued to the cup. It is not Coriolis effect! Jim
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Today's Featured Article - The David Brown Rose Badge - by Samuel Kennedy. In the 13th century civil war was raging in England. Two English noblemen were involved in a conflict which became known as the War of the Roses. The Duke of York had as his emblem a white rose and the Earl of Lancaster had a red rose. Today the white rose is the official emblem of the county of Yorkshire and the red rose has been adopted by the neighboring county of Lancashire.
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