But he began to believe in himself. His next work was upon the applications of the vibratory principle in telegraphing, upon which so many of his subsequent inventions were founded. His first ambitious attempt was in the direction of a multiplex system for sending several messages over one wire at the same time. It was not much of a success, however, and Edison drifted to New York, where, after a vain attempt to interest the telegraph companies in his inventions, he established himself as an electrical expert ready for odd jobs and making a specialty of telegraphy. One day the Western Union Company had trouble with its Albany Wire. The wire wasn't broken, but wouldn't work, and several days of experimenting on the part of the company's electricians only served to puzzle them the more. As a forlorn hope they sent for young Edison. "How long will you give me?" he asked. "Six hours?" The manager laughed and told him he would need longer than that. Edison sat down at the instrument, established communication with Albany by way of Pittsburgh, told the Albany office to put their best man at the instrument, and began a rapid series of tests with currents of all intensities. He directed the tests from both ends, and after two hours and a half told the company's officers that the trouble existed at a certain point he named on the line, and he told them what it was. They telegraphed the office nearest this point the necessary directions, and an hour later the wire was working properly. This incident first established his value in New York as an expert, and the business became profitable. Moreover, it led the different telegraph companies to give respectful attention to what he had to offer in the way of patented devices.