At Memphis he perfected his telegraph repeater and was the first to bring New Orleans into direct communication with New York. However, the manager at Memphis was jealous of him and dismissed him. Shabby and destitute, he made his way back to Louisville, walking a hundred miles of the way, and resumed his old position. After he had worked in the Louisville office for two years, his experimenting again got him into trouble. He upset some sulphuric acid, part of which trickled through the floor and spoiled the carpet in the manager's room below. For this he was discharged. He next went to New Orleans, intending to sail for Brazil; but the ship had gone and an old Spanish sailor advised him to stay in America. He went back to Cincinnati, where he made some of his first experiments in duplex telegraphy, a system whereby two messages may be sent over the same wire at the same time. A little while afterward, as poor as ever and as unattractive in dress, he walked into the telegraph office in Boston, where he had procured work. His co-workers there, thinking they would have some fun at his expense, set him to receiving messages from the most rapid operators in New York. Instead of throwing up his hands in defeat, as his companions expected, he received the messages easily, with a good margin to spare, and asked the operator sending at the other end of the line to "please send with the other foot." He was at once placed regularly on the New York wire. While in Boston, Edison opened a small workshop, put many of his ideas into definite shape, and took out his first patent. It was upon a chemical apparatus to record votes. He tried to introduce this into Congress, but failed, although he proved that it "would work." He left Boston not only without money, but in debt, and went to New York. This was in 1871 when he was twenty-four years old. At that time an apparatus called a "gold indicator" was in use in the offices of about six hundred brokers, to show fluctuations in the prices of gold. The system was operated from a central office near Wall street. One day this central office was filled with six hundred messenger boys, each bringing the complaint that the machinery had broken. No one knew how to repair it. A stranger walked up, looked at the apparatus, and said to the manager, "Mr. Law, I think I can show you where the trouble is." The machinery was repaired, the office was cleared, and order was restored. "What is your name, sir?" asked the delighted manager. "Edison," was the reply. He was engaged as superintendent at a salary of $200 per month, and from that hour his fortunes were assured.