Moreover, the key at the farther end of the line could be so arranged as to make an impression on a piece of paper that was slowly drawn under it by clockwork. Now if the man at one end of the line held his key down for only an instant, this impression would look like a dot. If he held it down longer, it would look like a short dash. Morse combined these dots and dashes into an alphabet. For instance, one dash meant the letter "t," and so on. For a time people only laughed at Morse. But at length Congress gave him enough money to build a line from Baltimore to Washington. It was opened in 1844, and proved to be a success from the beginning. Other lines were soon built, and the Morse system, greatly improved, is still in use. The telegraph made it possible to operate long lines of railroad, as all the trains could be managed from one office so that they would not run into one another. It also made it possible to communicate with people afar off and get an answer in an hour or so. For both these reasons the telegraph was very important and with the railroads did much to unite the people of the different portions of the country.