The total length of the pipe is 7 miles and 134 feet. The pipe has an interior diameter of 12 inches, and is capable of delivering 2,200,000 gallons of water in twenty-four hours. The inlet of the pipe is on a spur from the main Sierra Nevada Range, and the outlet is on the crest of the Virginia Range of mountains. The pipe lies across the valley in the form of an inverted siphon. At the lowest point, the perpendicular pressure on the pipe is 1,720 feet, or about 800 pounds to the square inch. The inlet being 465 feet higher than the outlet, the water is forced through the pipe under tremendous pressure. The water is brought to the inlet from the sources of supply in two large covered flumes, and at the outlet end of the pipe is delivered into two large flumes, which carry it to Virginia City, a distance of twelve miles. This pipe was constructed of sheets of wrought iron riveted together. Each section was fastened with three rows of rivets. At the point of greatest pressure the iron was five-sixteenths of an inch in thickness, but near the ends, upon the sides of the two opposite mountains, it tapered down to one-sixteenth of an inch. In the construction of the pipe there were used 1,150,000 pounds of rolled iron and 1,000,000 rivets, while 52,000 pounds of lead were used in securing the joints of the sections. At each joint the sections were inserted into cast iron sleeves, and it was within these sleeves that the lead was used. The total weight of the sleeves was 442,500 pounds. The first flow of water through this pipe reached Gold Hill and Virginia City on the evening of August 1, 1873, amid the greatest rejoicings of the people of both towns. Cannons were fired, rockets sent up, and bands of music paraded the streets. Never before in any part of the world had water been conveyed under a pressure so great; and it still remains the greatest. Previous to this, 910 feet was the greatest perpendicular pressure under which water had ever been carried through an iron pipe. This had been accomplished by Mr. Schussler, at Cherokee Flat, California. Additional Great Pipes. In 1875 the water company laid alongside the first pipe a second having an inside diameter of ten inches. This pipe is lap-welded, and, there being no friction of rivet heads upon the water, the flow through it is equal to that through the twelve-inch pipe,—2,200,000 gallons every twenty-four hours.