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  2. Lewis (lifting appliance) - Wikipedia

    en.wikipedia.org/wiki/Lewis_(lifting_appliance)

    Lifting the stone a small distance from the ground before hoisting is the best way to test a lewis. Any sign of looseness or damage should be corrected by adjusting the lewis hole or packing the lewis with metal shims. To bed a stone using a lewis, the stone is placed on dunnage laid flat with enough clearance for a mortar bed to be placed ...

  3. Rock-climbing equipment - Wikipedia

    en.wikipedia.org/wiki/Rock-climbing_equipment

    Non-locking (top) and locking (bottom) carabiners. Carabiners are closed metal clips with spring-loaded gates that are used as connectors between the rope and various devices. Modern carabiners are made from a lightweight but strong aluminum alloy that can withstand the load of a fall. Carabiners come in various shapes, with the asymmetric ...

  4. Carabiner - Wikipedia

    en.wikipedia.org/wiki/Carabiner

    Center is a standard carabiner rating. Using a carabiner to connect to a rope. A carabiner or karabiner (/ ˌ k ær ə ˈ b iː n ər /), [1] often shortened to biner or to crab, colloquially known as a (climbing) clip, is a specialized type of shackle, a metal loop with a spring-loaded gate [2] used to quickly and reversibly connect components, most notably in safety-critical systems.

  5. Figure 8 (climbing) - Wikipedia

    en.wikipedia.org/wiki/Figure_8_(climbing)

    This device utilizes a large surface area in contact with a climbing rope to provide sufficient friction along with the proper technique to be used as a belay device or for rappelling. A figure 8 (sometimes just referred to as an 8) is used in conjunction with a climbing harness and locking carabiner to control a belayed climber's descent, or ...

  6. Lobster clasp - Wikipedia

    en.wikipedia.org/wiki/Lobster_clasp

    A lobster clasp, also known as a lobster hook, lobster claw, trigger clasp, or bocklebee clasp, is a fastener that is held closed by a spring. [ 1 ] [ 2 ] The lobster clasp is opened or closed by actuating a small lever, after which it is attached to (or removed from) a short link-chain or a ring-like structure.

  7. Ring cairn - Wikipedia

    en.wikipedia.org/wiki/Ring_cairn

    A ring cairn (also correctly termed a ring bank enclosure, but sometimes wrongly described as a ring barrow) is a circular or slightly oval, ring-shaped, low (maximum 0.5 metres high) embankment, several metres wide and from 8 to 20 metres in diameter. It is made of stone and earth and was originally empty in the centre.