In the late 1950s, American caver Bill Cuddington, known as " Vertical Bill ", developed the single rope technique ( SRT ) in the US . In 1958, two Swiss alpinists, Juesi and Marti teamed up, creating the first rope ascender known as the Jumar.
32.
Both twin and half ropes have the advantage of redundancy, as well as allowing a rappel along the full length of the climbing rope ( by tying both ropes together ), so that climbers can descend from a long multipitch route with fewer rappels than with a single rope.
33.
Later photographs suggest that it consisted of four posts, with a single rope on three sides, the fourth side being open towards the tram lines, but in the winter it is likely that the space was covered by a tarpaulin to offer the horses some brief shelter between duties.
34.
The argument could not be settled, and Jacot-Guillarmod, De Righi, and Pache decided to retreat from Camp V to Camp III . At 5 pm they left with four porters on a single rope, but a fall precipitated an avalanche that killed three porters as well as Alexis Pache.
35.
Then at 7 : 50 a . m . Monday, attached to a single rope, he astonished rescuers by performing a " self-assisted rescue " _ in which he essentially worked his way up along the narrow walls of the cave while rescuers pulled on a supporting rope from above.
36.
The proliferation of short, awkward and muddy pitches appear best suited to be tackled by wire ladders, but in the 1980s a team of divers from the Wessex Caving Club who passed the sumps, concluded that single rope technique was preferable, avoiding the need for excessive numbers of people to carry the equipment.
37.
The basic assumption of crevasse rescue is that two or more climbers are tied together with a climbing rope, forming a rope team; a standard number is three, one on each end and one in the middle, which means there are two available to hold a falling climber, but is not as complicated to manage as large numbers of people attached to a single rope.
