In a far from hopeful mood after his three years' residence abroad he embarked on the packet Sully, Captain Pell, and sailed from Havre for New York on October 1, 1832. Among the passengers was Dr. Charles T. Jackson, of Boston, who had attended some lectures on electricity in Paris, and carried an electro-magnet in his trunk. One day while Morse and Dr. Jackson, with a few more, sat round the luncheon table in the cabin, he began to talk of the experiments he had witnessed. Some one asked if the speed of the electricity was lessened by its passage through a long wire, and Dr. Jackson, referring to a trial of Faraday, replied that the current was apparently instantaneous. Morse, who probably remembered his old lessons in the subject, now remarked that if the presence of the electricity could be rendered visible at any point of the circuit he saw no reason why intelligence might not be sent by this means. The idea became rooted in his mind, and engrossed his thoughts. Until far into the night he paced the deck discussing the matter with Dr. Jackson, and pondering it in solitude. Ways of rendering the electricity sensible at the far end of the line were considered. The spark might pierce a band of travelling paper, as Professor Day had mentioned years before; it might decompose a chemical solution, and leave a stain to mark its passage, as tried by Mr. Dyar in 1827; Or it could excite an electro-magnet, which, by attracting a piece of soft iron, would inscribe the passage with a pen or pencil. The signals could be made by very short currents or jets of electricity, according to a settled code. Thus a certain number of jets could represent a corresponding numeral, and the numeral would, in its turn, represent a word in the language. To decipher the message, a special code-book or dictionary would be required. In order to transmit the currents through the line, he devised a mechanical sender, in which the circuit would be interrupted by a series of types carried on a port-rule or composing-stick, which travelled at a uniform speed. Each type would have a certain number of teeth or projections on its upper face, and as it was passed through a gap in the circuit the teeth would make or break the current. At the other end of the line the currents thus transmitted would excite the electro-magnet, actuate the pencil, and draw a zig-zag line on the paper, every angle being a distinct signal, and the groups of signals representing a word in the code. During the voyage of six weeks the artist jotted his crude ideas in his sketch-book, which afterwards became a testimony to their date. That he cherished hopes of his invention may be gathered from his words on landing, 'Well, Captain Pell, should you ever hear of the telegraph one of these days as the wonder of the world, remember the discovery was made on the good ship Sully.'