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 and smooth.

The substances of which they are composed have been pressed together by a tremendous force.