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Aid climbing is a form of rock climbing that uses mechanical devices and equipment, such as aiders (or ladders), for upward momentum. [1] Aid climbing is contrasted with free climbing (in both its traditional or sport free climbing formats), which only uses mechanical equipment for protection, but not to assist in upward momentum.
Copperheads are only used in aid climbing but their low strength means that they can only handle the "static bodyweight" of an ascending aid climber and will likely fail if the climber makes a dynamic fall. At times, climbers will "clean out" build-ups of copperheads on an aid climbing route. [6] [35]
The Mayo Clinic diet, a program that adheres to this notion, was developed by medical professionals based on scientific research, so you can trust that this program is based on science, and not ...
A A-grade Also aid climbing grade. The technical difficulty grading system for aid climbing (both for "original" and an adapted version for "new wave"), which goes: A0, A1, A2, A3, A4, A5 and up to A6 (for "new wave"). See C-grade. Abalakov thread Abalakov thread Also V-thread. A type of anchor used in abseiling especially in winter and in ice climbing. ABD Also assisted braking device. A term ...
The Everest letters outline Mallory’s meticulous preparations and equipment tests, and his optimism about their prospects. But the letters also show the darker side of mountaineering: bad ...
Bicycle chains Roller chain and sprocket. A bicycle chain is a roller chain that transfers power from the pedals to the drive-wheel of a bicycle, thus propelling it.Most bicycle chains are made from plain carbon or alloy steel, but some are nickel-plated to prevent rust, or simply for aesthetics.
A shaft-driven bicycle is a bicycle that uses a drive shaft instead of a chain to transmit power from the pedals to the wheel. Shaft drives were introduced in the 1880s, but were mostly supplanted by chain-driven bicycles due to the gear ranges possible with sprockets and derailleurs .
The effects of high altitude on humans are mostly the consequences of reduced partial pressure of oxygen in the atmosphere. The medical problems that are direct consequence of high altitude are caused by the low inspired partial pressure of oxygen, which is caused by the reduced atmospheric pressure, and the constant gas fraction of oxygen in ...