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A Ferris wheel is a large runner-like mechanical construction facility with a cockpit (Gondola) for passengers hanging on the edge of the wheel. Passengers sit on the Ferris wheel and slowly turn up, and can overlook the surrounding scenery from a high place.

According to the difference of the operating mechanism, the Ferris wheel can be divided into three types: the gravity Ferris wheel (Ferris Wheel), the spokeless Ferris wheel and the Observation Wheel (Observation Wheel). The cockpit of the gravity Ferris wheel is hung on the wheel to maintain the level of the sliding shaft by gravity; while the cockpit on the observation wheel is suspended outside the wheel, which requires a more complicated mechanical structure of connecting rods, which rotates with the carriage. position to synchronously adjust its hold level.