"Five years ago the President sent for me," explained the Chief Engineer, "and asked if I could plan an observatory on Mount Everest. I replied that I would try to do so if the Government saw fit to place me in charge of the undertaking. I received my commission the next day and, calling to my aid two of the ablest engineers in the service of the Government, we selected a site for the entrance of the tunnel and next we searched for suitable power to do the work. We found a waterfall twenty miles distant, where we built a power house, installed turbines and dynamos and built an electric line to this place. We then erected a machine shop, in which we placed our electric engines and air compressors, and built a railroad connecting with the main line, and after we had done that we started the tunnel. As you will observe, the tunnel is a round bore twelve feet in diameter, and no explosives were used in making it. We used a tunneling machine driven and operated by compressed air, boring on the average fifty feet every twenty-four hours, and we washed the debris away by a powerful stream of water directed against the face of the tunnel so as not to obstruct the work. We gave the tunnel for the first five miles a grade of one foot in ten and from that point to the summit a grade of sixty degrees, and laid heavy steel segment rails six feet apart bolted to the solid rock, by this means dispensing with ties and permitting a free flow of water and slum. We found it necessary to build a chamber within the mouth of the tunnel sixty feet long, with automatic doors opening and shutting, to secure an abundance of air in the tunnel, and also in the observatory. The tunnel required no timbering, as we bored all the way through synetic granite and encountered very little water, and when we were about to break through at the summit we provided the workmen with fur clothing, and with air respirators, so that they would not be overcome by the cold and rarety of the atmosphere. We had a car driven by electricity to carry the men and material into the tunnel, having four cogwheel drivers on each side, and the tunnel throughout was lighted by electricity. We built the observatory of composition metal and glass, which was carried up on the car-but come along and you shall see for yourself."