“As to the distance I should have to descend, when you come to consider it, it is nothing. What is fourteen miles in a tunnel through a mountain? Some of those on the Great Straightcut Pacific Railroad are forty miles in length, and trains run backward and forward every day without any one considering the danger; and yet there is really more danger from one of those tunnels caving in than in my perpendicular shaft, where caving in is almost impossible. “As to the danger which attends so great a descent, I have thoroughly provided against that. In fact, I do not see, if I carry out my plans, how there could be any danger, more than constantly surrounds us, no matter what we are doing. In the first place, we should not think of that great depth. If a man fell down any one of the deep shafts in our silver mines, he would be as thoroughly deprived of life as if he should fall down my shaft. But to fall down mine--and I want you to consider this, Margaret, and thoroughly understand it--would be almost impossible. I have planned out all the machinery and appliances which would be necessary, and I want to describe them to you, and then, I am sure, you will see for yourself that the element of danger is more fully eliminated than if I should row you on the lake in a little boat.” She sat quiet, still pale, still listening, her eyes fixed upon him. “I have devised a car,” he said, “in which I can sit comfortably and smoke my cigar while I make the descent. This, at the easy and steady rate at which my engines would move, would occupy less than three hours. I could go a good deal faster if I wanted to, but this would be fast enough. Think of that--fourteen miles in three hours! It would be considered very slow and easy travelling on the surface of the earth. This car would be suspended by a double chain of the very best toughened steel, which would be strong enough to hold ten cars the weight of mine. The windlass would be moved by an electric engine of sufficient power to do twenty times the work I should require of it, but in order to make everything what might be called super-safe, there would be attached to the car another double chain, similar to the first, and this would be wound upon another windlass and worked by another engine, as powerful as the first one. Thus, even if one of these double chains should break--an accident almost impossible--or if anything should happen to one of these engines, there would be another engine more than sufficient for the work. The top of this car would be conical, ending in a sharp point, and made of steel, so that if any fragment in the wall of the tunnel should become dislodged and fall, it would glance from this roof and fall between the side of the car and the inner surface of the shaft; for the car is to be only twenty-six inches in diameter-quite wide enough for my purpose--and this would leave at least ten inches of space all around the car. But, as I have said before, the sides of this tunnel are hard