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The Telephone 159 so rapidly that it was not long before it became a complete financial success, and to-day ranks as the hardest worked 900 miles length of telephone trunk road in the world. Now the movement across the continent was re- vived and accelerated, Omaha, 300 miles beyond, was the next objective. Then without pausing, the line- men continued on to Denver, which city was switched into New York, 2,100 miles, in 1911. By 1913 the length of the transcontinental was increased to 2,600 miles by tacking on the 500 miles section from Denver to Salt Lake City. While this latter sec- tion was in progress arrangements for completing the last span to the Pacific coast were hurried for- ward, and this final span of 800 miles was completed with such celerity, despite the fact that broad ex- panses of desert, salt sinks, and the towering Sierra Range had to be overcome, that San Francisco was brought into conversation with New York on January 25th, 1915. The transcontinental line ranks as one of the two longest stretches of trunk telephone road in the world. It is 3,400 miles in length, and in the provision of the two circuits 6,780 miles of copper wire, about one- sixth of an inch in thickness, have been used, strung upon 130,000 poles, and having an aggregate weight of 5,920,000 lb. A few months after the completion of the American transcontinental telephone line the Dominion of Canada was spanned in a similar manner by the selfsame company, the length of the line being 4,200 miles. The realisation of such long-distance telephony was brought about by the wonderful invention of a