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  2. Treadwheel crane - Wikipedia

    en.wikipedia.org/wiki/Treadwheel_crane

    The Roman Polyspaston crane, from Ancient Greek πολύσπαστον (polúspaston, “compound pulley”), when worked by four men at both sides of the winch, could lift 3000 kg. In case the winch was replaced by a treadwheel, the maximum load even doubled to 6000 kg at only half the crew, since the treadwheel possesses a much bigger ...

  3. Crane (machine) - Wikipedia

    en.wikipedia.org/wiki/Crane_(machine)

    Manual crane from the late 19th century used for unloading small loads from ships at the Port of Barcelona, Spain A crane is a machine used to move materials both vertically and horizontally, utilizing a system of a boom , hoist , wire ropes or chains , and sheaves for lifting and relocating heavy objects within the swing of its boom.

  4. Chance Rides - Wikipedia

    en.wikipedia.org/wiki/Chance_Rides

    The Giant Wheel/Century Wheel was introduced in various sizes in both park and portable models in 1988. [ 9 ] In 2006, Chance worked with Ronald Bussink Professional Rides of Switzerland and Dutch Wheels BV, a division of Vekoma Rides, to produce larger wheels such as the Niagara SkyWheel which stands 53.3 m (175 ft) tall. [ 10 ]

  5. Hoist (device) - Wikipedia

    en.wikipedia.org/wiki/Hoist_(device)

    Hoist atop an elevator. A hoist is a device used for lifting or lowering a load by means of a drum or lift-wheel around which rope or chain wraps. It may be manually operated, electrically or pneumatically driven and may use chain, fiber or wire rope as its lifting medium.

  6. Jack (device) - Wikipedia

    en.wikipedia.org/wiki/Jack_(device)

    A jack which can lift a mobile home. A jack is a mechanical lifting device used to apply great forces or lift heavy loads. A mechanical jack employs a screw thread for lifting heavy equipment. A hydraulic jack uses hydraulic power. [1] The most common form is a car jack, floor jack or garage jack, which lifts vehicles so that maintenance can be ...

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