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 - An Old-Time Tractor Demonstration - by Kim Pratt. Sam was born in rural Kansas in 1926. His dad was a hard-working farmer and the children worked hard everyday to help ends meet. In the rural area he grew up in, the highlight of the week was Saturday when many people took a break from their work to go to town. It was on one such Saturday in the early 1940's when Sam was 16 years old that he ended up in Dennison, Kansas to watch a demonstration of a new tractor being put on by a local dealer. It was an Allis-Chalmers tractor dealership,
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