TABLE 53.-Relation between the magnetic constants of steel and hardness-Continued. 4. Magnets annealed 6 hours in steam.

TABLE 53.-Relation between the magnetic constants of steel and hardness-Continued. 7. Magnets annealed 1 hour in aniline vapor.

TABLE 53.-Relation between the magnetic constants of steel and hardness-Continued. 10. Magnets annealed 13 hours in aniline vapor.

TABLE 53.-Relation between the magnetic constants of steel and hardness—Continued. 13. Magnets annealed 1 hour in melting zinc.

DISCUSSION.

Digest.-Our present purpose will be greatly facilitated by a tabular comparison of the essential features of the results in hand. The following digest (Tables 54 to 59) contains, besides brief descriptions of temper, the hardness as represented by the specific resistance s, together with the corresponding magnetic moments per unit of mass, m, of the several rods.