For the next two years what does the narrator do with his discovery?

From the text:

We followed it in preference to all our studies. We worked with it, we tested it in more ways than we can describe, and each step was as another miracle unveiling before us. We came to know that we had found the greatest power on earth. For it defies all the laws known to men. It makes the needle move and turn on the compass which we stole from the Home of the Scholars; but we had been taught, when still a child, that the loadstone points to the north and that this is a law which nothing can change; yet our new power defies all laws. We found that it causes lightning, and never have men known what causes lightning. In thunderstorms, we raised a tall rod of iron by the side of our hole, and we watched it from below. We have seen the lightning strike it again and again. And now we know that metal draws the power of the sky, and that metal can be made to give it forth.

We have built strange things with this discovery of ours. We used for it the copper wires which we found here under the ground. We have walked the length of our tunnel, with a candle lighting the way. We could go no farther than half a mile, for earth and rock had fallen at both ends. But we gathered all the things we found and we brought them to our work place. We found strange boxes with bars of metal inside, with many cords and strands and coils of metal. We found wires that led to strange little globes of glass on the walls; they contained threads of metal thinner than a spider's web.

These things help us in our work. We do not understand them, but we think that the men of the Unmentionable Times had known our power of the sky, and these things had some relation to it. We do not know, but we shall learn. We cannot stop now, even though it frightens us that we are alone in our knowledge.