With a troubled look upon his face he gazed upon it. The needle now pointed to 1,007.8, or to a reading of 16 degrees 47.8 minutes.
“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 cubic inches of air under pressure of twelve atmospheres, or, in round numbers, 96,000 cubic inches; giving me plenty of air for over five hours, without counting that which may be in the chamber. Before that time I will be out of the place. Last comes the wooden frame and wheel; that we will now set in position. I had this made for fear that I might not have the necessary strength to open the door when the time came; with it in position I can bring a pressure to bear upon the slab door of this chamber and burst it open, if need be. Do you understand it all now?” and he smiled at the curious expression on their faces.
“Yes,” said Hathaway; “but why have you gone to all this trouble with that compass, when you could have put in good-sized springs, as well?”
“That is just it, my boy. I could not have put in a spring just as well. Had I used a spring, it might be rusted or broken by the time I would want it to work. Batteries could not be thought of at all, as they would not keep so long. In fact, I had to get something that was as sure in its work as the earth is in its movement around the sun. Nothing is more sure than that the compass needle will slowly turn back toward the west. It is simple and sure; why, then, should I seek for anything different?”
“I understand it all; your explanation is quite clear,” said Craft. “It is a most marvelous and ingenious combination of natural laws with human auxiliaries.”
Taking his watch out of his pocket, Cobb then said:
“The time is passing; let us at once to our work. You both know your duties; so commence.”
At exactly thirty minutes past two, Cobb had taken the opium and had his nostrils, and mouth between the lips and teeth, filled with fine asbestos cloth, while strips of the same material were placed over his whole face, leaving but a small opening for the platinum tube between his lips. He had previously thoroughly saturated the bandages about his loins and body with the brown compound which he took from the bottles, and which he had informed them was the nourishment to give sustenance to his system during the period of his inanimation.
Lying down within the plaster mold, he told them to place the door in its position. Craft and Hathaway, by hard work, got it on to the hinges, and fastened the catch; then opening the little top door, asked Cobb if it was all right so far.
“Yes,” answered Cobb, partly opening his mouth, and speaking through the filling. “Yes; it is all right. And now, no tears, no show of grief; let me say a lasting farewell. I thank you, dear boys, for all your kindness to me, and it grieves me sorely that I will never again see you; but such is fate! May God bless you a thousand fold, and watch over you through life, is my last wish! Take my hand, each of you; there, that is right; good-bye! Now fit the plaster well over my face, and look to your watches.”