Two forces, American science and American business capacity, have accomplished this result. As a mechanism, this American telephone system is the product not of one but of many minds. What most strikes the imagination is the story of Alexander Graham Bell, yet other names--Carty, Scribner, Pupin--play a large part in the story. The man who discovered that an electric current had the power of transmitting sound over a copper wire knew very little about electricity. Had he known more about this agency and less about acoustics, Bell once said himself, he would never have invented the telephone. His father and grandfather had been teachers of the deaf and dumb and had made important researches in acoustics. Alexander Graham Bell, born in Edinburgh in March, 1847, and educated there and in London, followed the ancestral example. This experience gave Bell an expert knowledge of phonetics that laid the foundation for his life work. His invention, indeed, is clearly associated with his attempts to make the deaf and dumb talk. He was driven to America by ill-health, coming first to Canada, and in 1871 he settled in Boston, where he accepted a position in Boston University to introduce his system of teaching deaf-mutes. He opened a school of "Vocal Physiology," and his success in his chosen field brought him into association with the people who afterward played an important part in the development of the telephone. Not a single element of romance was lacking in Bell's experience; his great invention even involved the love story of his life. Two influential citizens of Boston, Thomas Sanders and Gardiner G. Hubbard, had daughters who were deaf and dumb, and both engaged Bell's services as teacher. Bell lived in Sanders's home for a considerable period, dividing his time between teaching his little pupil how to talk and puttering away at a proposed invention which he called a "harmonic telegraph." Both Sanders and Hubbard had become greatly interested in this contrivance and backed Bell financially while he worked. It was Bell's idea that, by a system of tuning different telegraphic receivers to different pitches, several telegraphic messages could be sent simultaneously over the same wire. The idea was not original with Bell, although he supposed that it was and was entirely unaware that, at the particular moment when he started work, about twenty other inventors were struggling with the same problem. It was one of these other twenty experimenters, Elisha Gray, who ultimately perfected this instrument. Bell's researches have an interest only in that they taught him much about sound transmission and other kindred subjects and so paved the way for his great conception. One day Hubbard and Sanders learned that Bell had abandoned his "harmonic telegraph" and was experimenting with an entirely new idea. This was the possibility of transmitting the human voice over an electric wire. While working in Sanders's basement, Bell