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==History==
Archeologists who investigated ancient [[Celt|Celtic]] and [[Ancient Egypt|Egyptian]] [[Archaeology|sites]] in the 19th century found celts which exhibited the spin-reversal motion. The [[antiquarian]] word "[[Celt (tool)|celt]]" (the "c" is pronounced as "s") describes [[adze]]-, [[axe]]-, [[chisel]]- and [[Hoe (tool)|hoe]]-shaped [[Lithic analysis|lithic]] tools and weapons.
The first modern descriptions of these celts were published in the 1890s when [[Gilbert Walker|Sir Gilbert Thomas Walker FRS]] wrote his "On a curious dynamical property of celts" for the ''Proceedings of the Cambridge Philosophical Society'' in Cambridge, England, and "On a dynamical top" for the ''Quarterly Journal of Pure and Applied Mathematics'' in Somerville, Mass.
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