ABSTRACT
One of the most interesting examples of the importance of water power is the new industry for the manufacture of Norwegian saltpetre by the method. The source of power consists of three lakes—Maarvand, Mosvand, and Tinnsjo—situated in Southern Norway. The water enters ten sets of Pelton wheels each developing from 14,000 to 19,000 horse-powers, and then passes through another tunnel to a second power house three miles away and 909 feet lower, to be opened in 1914. In Sweden again advantage is rapidly being taken of the hundreds of upland lakes, and the waterfalls and torrents which convey the overflow to the sea. Twelve falls on the Dal river alone are capable of yielding 175,000 horse-powers, and less than half this is as yet employed. The electricity is distributed over wide areas and lights towns, drives machinery, and provides the motive power of an increasing portion of the State railways.
