Abstract :
Mountain climbers who attain freezing heights suffer from cold in spite of their physical exertions but aviators who soar to even bitterer temperatures can keep warm in spite of the fact that they must sit motionless as their planes climb to “the roof of the sky.” They keep warm electrically. The latest development in flying equipment is a set of clothing warmed by wire, even to the glass of a flier´s goggles.
