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An extension ladder. A ladder is a vertical or inclined set of rungs or steps commonly used for climbing or descending. There are two types: rigid ladders that are self-supporting or that may be leaned against a vertical surface such as a wall, and rollable ladders, such as those made of rope or aluminium, that may be hung from the top.
Fixed ladders are generally made of sturdy materials such as: aluminum or fiberglass, but can also consist of reinforced polymers, stainless steel, hot dipped galvanized steel, or wood. Aluminum: This metal is corrosion-resistant and lightweight, making it an ideal; Steel: Another sturdy metal, steel is also used for fixed ladders. However, it ...
24 tonnes of equipment left Britain in over 1000 crates and needed to pass through 22 customs posts. Relatively little climbing gear was needed because the climb would be largely non-technical and oxygen cylinders, climbing rope and lightweight ladders were the major requirements.
Ladders are usually made in 5, 8 or 10 m (16, 26 or 33 ft) lengths, and can be clipped together to make longer lengths. While ladders can be used without a belay, this is unsafe and is not recommended. Ladders may be carried coiled, without other protection, until needed, or may be carried inside tough PVC tackle-bags.
It is the use of spreaders (long treads that extend well past the vertical ropes) in a pilot ladder that distinguishes it from a Jacob's ladder. When not being used, the ladder is stowed away, usually rolled up, rather than left hanging. On late 19th-century warships, this kind of ladder would replace the normal fixed ladders on deck during battle.
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