In addition, plastic and metal have largely supplanted the use of wood in tops.Fixed tip tops are featured in National Championships in Chico, California and in the World Championships in Orlando, Florida.
are exploited in various ways in such championships and by the main top makers (obviously, an optimisation of both characteristics has to be somehow restricted by conditions on mass and/or diameter and by practical considerations about the rim not touching the spinning surface too early): A top may also be used to demonstrate visual properties, such as by James David Forbes and James Clerk Maxwell in Maxwell's disc (see color triangle). [established] that blue and yellow do not make green, but a pinkish tint, when neither prevails in the combination…[and the] result of mixing yellow and blue was, I believe, not previously known.
By rapidly spinning the top, Forbes created the illusion of a single color that was a mixture of the primaries:[The] experiments of Professor J. The Jean Shepherd story "Scut Farkas and the Murderous Mariah" revolves around top-spinning in the fictional Depression-era American city of Hohman, Indiana.
In the "sleep" period, and only in it, provided it is ever reached, less friction means longer "sleep" time (whence the common error that less friction implies longer global spinning time) There have been many developments within the technology of the top.
Bearing tops, with a tip made of a small hard ceramic, tungsten carbide or even ruby ball (sometimes wrongly believed to spin with respect to the body of the top), have been one of the biggest changes.
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Some tops can be thrown, while firmly grasping a string that had been tightly wound around the stem, and the centrifugal force generated by the unwinding motion of the string will set them spinning upon touching ground.