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  2. Differential pulley - Wikipedia

    en.wikipedia.org/wiki/Differential_pulley

    Because there is a traveling pulley at the load, this doubles the mechanical advantage of the fixed (anchored) sprocket assembly, leading to a total mechanical advantage of 2 × ⁠ P 1 / P 1 − P 2 ⁠. For instance, a 1-ton differential chain fall might have a 15-pocket and a 14-pocket sprocket set.

  3. 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.

  4. Hoist controller - Wikipedia

    en.wikipedia.org/wiki/Hoist_controller

    A hoist controller is the controller for a hoist. The term is used primarily in the context of electrically operated hoists, but it is apparent that the control systems of many 20th century steam hoists also incorporated controllers of significant complexity. Consider the control system of the Quincy Mine No. 2 Hoist. [1]

  5. Airlines seen making $1 trillion for the first time in history

    www.aol.com/airlines-seen-making-1-trillion...

    The global airline industry will likely rake in more than $1 trillion in revenue next year, as passenger numbers look set to hit an all-time high of 5 billion, the International Air Transport ...

  6. Here Are The All-Time Record Cold Low Temperatures In All 50 ...

    www.aol.com/heres-time-record-cold-low-170000238...

    Even Florida has seen a subzero temperature with Tallahassee dropping to minus 2 degrees during the most brutal U.S. cold outbreak on record in Feb. 1899. Montana is the coldest in continental U.S ...

  7. Trump complains that US flags will be half-staff on his ...

    www.aol.com/news/trump-complains-us-flags-half...

    President-elect Donald Trump complained on Friday that American flags would still be lowered to half-staff in honor of the late President Jimmy Carter during Trump's Jan. 20 inauguration.

  8. Hoist (mining) - Wikipedia

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

    A drum hoist (steel wire rope visible) and motor. In underground mining a hoist or winder [1] is used to raise and lower conveyances within the mine shaft.Modern hoists are normally powered using electric motors, historically with direct current drives utilizing Ward Leonard control machines and later solid-state converters (), however modern large hoists use alternating current drives that ...

  9. Hoist - Wikipedia

    en.wikipedia.org/wiki/Hoist

    Hoist controller, a machine for raising and lowering goods or personnel by means of a cable; Hydraulic hooklift hoist, another machine; Hoist (mining), another machine; Hoist (flag), the half of a flag nearer to the flagpole; Hoist, by Phish; USS Hoist (ARS-40), a Bolster class rescue and salvage ship acquired by the U.S. Navy during World War II

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