At the time, telegraph wires blanketed the skies of Boston, hanging in a dense web above the buildings. Many desperately wished for someone to develop a telegraph that could send multiple messages over the same wire, so that many wires could be replaced with just one. The theory was that if one could transmit the messages using different tones, they would “harmonize” instead of interfere, leading the idea to be called the “harmonic telegraph”. Naturally, Alexander Graham Bell turned his tinkering to this problem and persuaded Hubbard (as well as Thomas Sanders, another father of a Bell student) to finance his research in exchange for a share of any future US profits. Further complicating matters, Bell had fallen in love with his student, Mabel Hubbard. Mr. Hubbard made it clear he did not approve of such a marriage unless Bell made a profitable discovery.