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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.
It consists of vertical ropes or chains supporting horizontal, historically round and wooden, rungs. Today, flat runged flexible ladders are also called Jacob's ladders. [3] They are used to allow access over the side of ships, and as a result, pilot ladders are often incorrectly referred to as Jacob's ladders. A pilot ladder has specific ...
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 ...
Attic ladders are usually made of wood, metal, aluminum, or fiberglass. Also, fire departments carry attic ladders on fire apparatus for use to locate and extinguish fires in attic spaces. They are in a single ladder that is often used by firefighters for interior attic access and have hinged rungs, which allow them to be folded inward so that ...
Campus boards can take a variety of different forms and may incorporate a variety of materials. The earliest campus boards, still used today, were made of horizontal thin slats or wood rails attached to an inclined board in a ladder-like configuration. Later versions have utilized bolt-on climbing holds or sections of a pipe. A campus board is ...
A Dutch sand ladder is a cable or rope ladder with rungs usually made of wood, lying on a sandy slope to allow persons to ascend or descend with minimal erosion. [1] The bottom end is anchored and the top end is designed for easy disconnection so that the ladder can be lifted up to shake loose any sand that has accumulated on the rungs. [ 1 ]
How a CD ladder works. Let’s say you have $30,000 to invest in a high-yield CD. You might put the entire lump sum into a long-term CD of 12 months or longer to earn a high rate of return.
The Flørli stairs, in Lysefjorden, Norway, have 4,444 wooden steps that climb from sea level to 740 metres (2,428 feet). It is a maintenance stairway for the water pipeline to the old Flørli hydro plant. The hydro plant is now closed down, and the stairs are open to the public. The stairway is claimed to be the longest wooden stairway in the ...