National Geographic : 1954 Jul
D-Day Minus Two: + First Team Moves Up Both Bourdillon, ahead, and deputy leader Evans are wear ing the closed-circuit type of oxygen set. One oxygen bottle rides high on each pack frame. Beneath it are white soda-lime canisters, used for purifying air, and a metal box contain ing the breathing bag (page 20). This British team stayed at the South Col only two nights and a day, to avoid the deteri oration affecting men at su preme altitudes. Their objec tive: to reach Everest's South Peak, appraise the final ridge, and, if feasible, go on to the top. +' Lives Hang on This Oxygen Set Check In the sun-baked, protected valley of the Western Cwm, Bourdillon and Evans suffered from the heating effect of their breathing sets. But as they rose into the cold, bitter at mosphere of Everest's upper ridges, they appreciated the warm, moist air filtered into their masks and the lift of inhaling pure oxygen.