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- The names Egg of Columbus and Columbus Egg have been used for several mechanical toys and puzzles inspired on the legend of Columbus balancing an egg on its end to drive a point. Typically, these puzzles are egg-shaped objects with internal mechanisms that make the egg stand up, once the user discovers the secret. Mechanisms typically used in such toys include moving weights, mercury flowing in sealed tubes or compartments, and rolling on grooves and pits. (en)
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- US496716A patent drawing showing the mechanism of an Egg of Columbus puzzle (en)
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- The names Egg of Columbus and Columbus Egg have been used for several mechanical toys and puzzles inspired on the legend of Columbus balancing an egg on its end to drive a point. Typically, these puzzles are egg-shaped objects with internal mechanisms that make the egg stand up, once the user discovers the secret. Mechanisms typically used in such toys include moving weights, mercury flowing in sealed tubes or compartments, and rolling on grooves and pits. (en)
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- Egg of Columbus (mechanical puzzle) (en)
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