Ascender (climbing)
An ascender is a device (usually mechanical) used for directly ascending a rope, or for facilitating protection with a fixed rope when climbing on very steep mountain terrain. A form introduced in the 1950s became so popular it begat the term "Jumar" for the device, and the verb "to jumar" to describe its use in ascending.
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Ascenders can also be used as a braking component within a rope hauling system, often used in rescue situations.
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