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 Collection of a Lifetime - by Sherry Schaefer. The larest gathering of orphan tractors ever assembled by one collector will be auctioned off on May 15 in Rock Island, IL. Ed Spiess was a well known tractor buff who spent most of his time dreaming of rare and unknown tractors. His background as an agricultural engineer sparked his interest in the unique attributes of the models built from 1939-1959.
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