October 1, 1832, he sailed from Havre, on the packet ship Sully, for New York. That passage marked an epoch not only in the life of S. F. B. Morse, but an epoch in American progress. At the dinner-table the conversation turned upon recent discoveries in electro-magnetism, and the experiments of Ampère with the electro-magnet. Morse said, "If the presence of electricity can be made visible in any part of the circuit," and he had seen that it could years before in the class-room at Yale College, "I see no reason why intelligence may not be transmitted instantaneously by electricity." He thought the subject over as he walked upon the deck, and as he lay in his berth, too deeply interested to sleep. If intelligence could be transmitted, it could be recorded. He took from his pocket a note-book, and thought out his alphabet of dots and lines. He showed his sketches to his fellow-passengers,--not a wise thing, as it proved, when, later, one of the persons on board laid claim to the invention, causing some years of litigation. When the vessel reached New York, Morse said, "Well, captain, should you hear of the telegraph one of these days as the wonder of the world, remember the discovery was made on board the good ship Sully." Electricity had been known and studied since early times. It had been ascertained that the electric force could be stored up, as in the Leyden jar, and that it could be conducted through long metallic wires. The discovery of the Voltaic pile, or battery, in 1800, gave a great impetus to the study. Oersted of Copenhagen found that the position of the magnetic needle may be changed by the electric current, and that a magnet will induce electricity in a coil of wire. Schweigger of Halle discovered that "the deflection of the needle may be increased by coiling an insulated wire in a series of ovals or flat rings, compactly disposed, in a loop, and conducting the current around the needle from end to end." Ampère developed the theory of electro-magnetism, and proposed to the French Academy in 1820 a plan for a telegraph, in which there was to be a needle for each letter. In 1827 Morse had listened to a course of lectures, given by Prof. James Freeman Dana, upon these matters, so that the subject was still fresh in his mind when he crossed the ocean in the Sully. Prof. Joseph Henry's important discoveries were also well known.