"This is caused by some local attraction," he said, looking around. Then, suddenly: "Ah! I see it! It is caused by those two iron chests. But I fear it cannot be helped; for if they are moved into any other position, the attraction, though it might not be so great now, would be greater at some future time. It cannot be helped! I am sorry, for it will add nearly a year to my stay in this chamber. You perceive that the needle of that compass points to 1,007.8, or 16 degrees 47.8 minutes. That is the magnetic variation, plus 14.8 minutes for those iron boxes, of this place at the present moment. The magnetic pole is moving slowly toward the west; very slowly, indeed, but fast enough for me to utilize its movement. At present it is moving but 0.3 minutes per year, but this movement is increasing in a direct ratio of 0.145 minutes per year, which will bring the change in the variation, in 1988, to within 14.85 minutes of where the little hanging catch now is. My calculations were for one hundred years, but those iron boxes will carry it just one year longer, or to January 1, 1989. As I said, the needle will move 0.445 minutes toward the west this year, and 0.590 minutes next, and so on, arriving at 4 degrees 34.85 minutes on January 1, 1988; but this will be still 14.85 minutes from the little catch which you see hanging down. In one year from that time, it will strike it. The instant that it does do so, the fine wheel-work is released, and the heavy weight will cause it to move; this movement will drop the large beam upon the glass bulbs of the batteries, break them, and drop the zinc into the electropoion fluid. The batteries will then work, and I will have my power. The flask of alcohol is broken, its contents saturating the asbestos feeder, while a current heating to a white heat the platinum strip, starts the fire. At the same time the same current through these magnets withdraws the bolt holding the under door of the glass case in which I am: it falls by my weight, and I roll upon the bed-springs, while the door, relieved of its weight, closes again, thus shutting off the escape of the ozone. In descending through the bottom of the case, the bandages are torn off of my face, and another current of electricity passes through my heart by means of the proper discs. Thus, you see, I am released from my ozone prison into good and fresh air; the ozone is shut off, and my life is brought back by the shock of electricity. From the alcohol heater, which is by this time all aglow, I receive the warmth necessary to again set my blood circulating properly through my veins. Of course, I am weak, very weak; so I at once commence refreshing myself from the liquors in those bottles. After that I prepare some of the beef juice, clothe myself in one of the suits I have in that small iron chest, and I am a new man. If the air in the chamber is not pure enough for me, I have plenty in that cylinder, and can turn it on at any time, for it contains 8,000