Humanity's historical fascination with wearable wheels
their skates bear striking similarities to those found previously in Europe, suggesting a potential knowledge exchange between the two Bronze Age civilizations.
mentioned in 1805, “when not having provided the means of retarding his velocity, or commanding its direction, he impelled himself against a mirror of more than five hundred pounds value, dashed it to atoms, broke his instrument to pieces and wounded himself most severely." Merlin’s early two-wheel inline design gave way to the classic four-wheel side-by-side build we all remember from the Disco Era. Not only did Plimpton’s skates offer a more stable rolling platform, they were the first to incorporate “trucks,” the cushioned, pivoting axles that virtually all modern skates and skateboards use.
On modern skates, the rotating wheel and the stationary axel are separated by two hollow-disc shaped devices called bearings. These bearings are designed so that the inner and outer surfaces, which each sit in contact with the wheel and axle, can spin freely. They can do this because of a ring of small spherical metal balls sandwiched between the two plates, which roll and rotate without generating significant amounts of friction or heat , allowing the spinning wheels to do the same.
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