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400 feet of string
"spin bar"
although it has been proposed that they be used in the investigation of planet Mars
"RATTLEBACK"
Daniel Bernoulli (1700-1782)
Rattleback - Simply Incredible - Easy to Use...Very Hard to Explain Colour:Orange 400 feet of stringA rattleback is a semi ellipsoidal top which will rotate on its axis in a preferred direction. If spun in the opposite direction, it becomes unstable, "rattles", stops and reverses its spin to the preferred direction! This spin reversal appears to violate the law of the conservation of angular momentum. Moreover, for most rattlebacks (including the one above) the motion will happen when the rattleback is spun in one direction, but not when spun in the
US$ 425.00
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