The coercive force, or coercivity, of a material is that reversed magnetic force which, while it is acting, just suffices to reduce the residual induction to nothing after the material has been temporarily submitted to any great magnetizing force.
As regards the higher temperatures, the chief point of interest is the observation that the curve of magnetization for annealed cobalt shows a small depression at about 450°, the temperature at which they had found the sign of the length-change to be reversed for all fields.
"Well, what if our roles were reversed?" she started with thoughtfulness.
Just as they had reversed their direction, Edith Shipton passed them, driving down the mountain, not speeding but too fast by Dean's conservative standards.