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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.
A high ball A boulder problem over circa 5–10-metre (16–33 ft) high, where falling is dangerous. [1] [2] hip belay A method of belaying, whereby the rope friction is increased by passing the rope around the hip of the belayer. hold A place to temporarily cling, grip, jam, press, or stand in the process of climbing a route. [2] See volume hold.
Telescoping in mechanics describes the movement of one part sliding out from another, lengthening an object (such as a telescope or the lift arm of an aerial work platform) from its rest state. [1] In modern equipment this can be achieved by a hydraulics , but pulleys are generally used for simpler designs such as extendable ladders and amateur ...
Climbers instead use cord (or "accessory cord"), which is a length of thinner approximately 4 to 8 mm (0.16 to 0.31 in) static kernmantle rope, tied via a double fisherman's knot into closed loops of any size. [1] [11] Cord loops (also known as "cordelettes") serve a wide variety of functions in rock climbing.
The horizontal and vertical poles were each made of one-inch aluminum tubes in two telescoping parts, anodized with a gold color. Due to the limits of the astronauts' spacesuits, the total height of the flagpole was limited to their 28-inch (71 cm) minimum and 66-inch (170 cm) maximum reach. The flag cost $5.50 and the tubing cost $75. [2]
Air conditioning is now standard on U.S. models. Like its predecessor, the chassis consists of a standard ladder frame design [2] and is built from galvanised steel with five tubular or box section cross members. The body is built of steel and aluminum around an ash frame.
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