The world today is on the eve of another great development in transportation, quite as revolutionary as any that have preceded. How soon will it take place? How long before Kipling's vision in "The Night Mail" becomes a full reality? How long before the air craft comes to play a great role in the world's transportation? We cannot tell. But, after looking at the nearest parallel in the facts of history, each of us may make his own guess. The airship appears now to be much farther advanced than the steamboat was for many years after Robert Fulton died. Already we have seen men ride the wind above the sea from the New World to the Old. Already United States mails are regularly carried through the air from the Atlantic to the Golden Gate. It was twelve years after the birth of Fulton's Clermont, and four years after the inventor's death, before any vessel tried to cross the Atlantic under steam. This was in 1819, when the sailing packet Savannah, equipped with a ninety horsepower horizontal engine and paddle-wheels, crossed from Savannah to Liverpool in twenty-five days, during eighteen of which she used steam power. The following year, however, the engine was taken out of the craft. And it was not until 1833 that a real steamship crossed the Atlantic. This time it was the Royal William, which made a successful passage from Quebec to London. Four years more passed before the Great Western was launched at Bristol, the first steamship to be especially designed for transatlantic service, and the era of great steam liners began. If steam could be made to drive a boat on the water, why not a wagon on the land? History, seeking origins, often has difficulty when it attempts to discover the precise origin of an idea. "It frequently happens," said Oliver Evans, "that two persons, reasoning right on a mechanical subject, think alike and invent the same thing without any communication with each other."* It is certain, however, that one of the first, if not the first, protagonist of the locomotive in America was the same Oliver Evans, a truly great inventor for whom the world was not quite ready. The world has forgotten him. But he was the first engine builder in America, and one of the best of his day. He gave to his countrymen the high-pressure steam engine and new machinery for manufacturing flour that was not superseded for a hundred years. * Coleman Sellers, "Oliver Evans and His Inventions," "Journal of the Franklin Institute", July, 1886: vol. CXXII, p. 16.