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2. Ascender (climbing) - Wikipedia

   en.wikipedia.org/wiki/Ascender_(climbing)

   Ascenders are usually used in pairs so that one is free to be slid up the rope whilst the other bears the weight of the climber. The ascender which has just been slid upwards is then made to take the climber's load, locking the climber to the rope, and freeing the other one so it can then be slid upwards too.

3. Can You Really Use An Ascender As A Belay Device? These ... - AOL

   www.aol.com/news/really-ascender-belay-device...

   Greetings from the Philippines! I was horrified the other day when I chanced upon these climbers belaying with an ascender. I gave them my best advice because I thought there was about to be a ...

4. Fixed rope - Wikipedia

   en.wikipedia.org/wiki/Fixed_rope

   In climbing and mountaineering, a fixed-rope (or fixed-line) is the practice of installing networks of in-situ anchored static climbing ropes on climbing routes to assist any following climbers (and porters) to ascend more rapidly—and with less effort—by using mechanical aid devices called ascenders.

5. Single-rope technique - Wikipedia

   en.wikipedia.org/wiki/Single-rope_technique

   In the 1930s, as caving became increasingly popular in France, several clubs in the Alps made vertical cave exploration an outdoor sport. During World War II, a team composed of Pierre Chevalier, Fernand Petzl, Charles Petit-Didier and others explored the Dent de Crolles cave system near Grenoble, France, which became the deepest explored cave in the world (-658m) at that time.

6. List of friction hitch knots - Wikipedia

   en.wikipedia.org/wiki/List_of_friction_hitch_knots

   A friction hitch is a kind of knot used to attach one rope to another in a way that is easily adjusted. These knots are commonly used in climbing as part of single-rope technique, doubled-rope technique and as "ratchets" to capture progress on a moving rope, most typically in a mechanical advantage system such as a Z-drag.

7. Self-locking device - Wikipedia

   en.wikipedia.org/wiki/Self-locking_device

   The earliest type of self-belay device used was the ubiquitous prusik knotted sling used by climbers. The method requires the solo climber to feed out an estimated length of belay rope so that they can reach their next stance and repeat the process as the rope is difficult to feed through the prusik knot while climbing.