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single rope technique
Single rope technique (SRT) is a set of methods used to descend and ascend on the same single rope. Single rope technique is used in caving, potholing, rock climbing, canyoning, roped access for building maintenance and by arborists for tree climbing.
==Historical developments==
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, such 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. The lack of available equipment during the war forced Pierre Chevalier and the rest of the team to develop their own equipment, leading to technical innovation. The first use of single rope technique with prusik and mechanical rope ascenders (Henri Brenot's "monkeys", first used by Chevalier and Brenot in a cave in 1934) can be directly traced back to the exploration of the Dent de Crolles cave system.
American caver Bill Cuddington, known as "Vertical Bill" developed the single rope techniques in the U.S. in the late 1950s. In 1958, two Swiss alpinists, Juesi and Marti teamed together, creating the first commercially-available rope ascender known as the Jumar. In 1968 Bruno Dressler asked Petzl, who worked as a metals machinist, to build a rope-ascending tool, today known as the Petzl Croll, that he had developed by adapting the Jumar to the specificity of pit caving. Pursuing these developments, Petzl started a small caving equipment manufacturing company Petzl, which is today a world leader in equipment for both caving, climbing, mountaineering and at-height safety in civil engineering. The development of the rappel rack and the evolution of mechanical ascension systems notably helped extend the practice and safety of pit exploration to a larger venue of established cavers.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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