How did all these changes become known? Orville Wright called attention to them in an affidavit in 1915 in the Wright-Curtiss lawsuit. One way to learn most of the facts is astonishingly simple. All that is necessary to any observer who knows what to look for is to make careful comparisons of the Smithsonian photographs of the original Langley machine with Smithsonian photographs of the machine tested at Hammondsport. It was learned, too, that even the engine used by Langley was changed in several respects. A modern type carburetor, a new intake manifold, a magneto ignition, and a modern radiator were installed. Though all these changes and many others were made in the machine at Hammondsport, the Smithsonian published only a few of them--the less important. It did not tell of the fundamental changes. And the Institution made statements that, by implication, practically amounted to a denial that any changes of importance had been made. By omitting from its published reports at the time and for many years afterward, the facts about the changes in the Langley machine, the Smithsonian Institution succeeded in deluding the public. If the stories about these fake tests had been issued by Curtiss, who conducted them, or by an organization less well known than the Smithsonian, they might not have been taken seriously. But when false and misleading announcements were backed by the prestige of a famous scientific institution, it was possible to have the fraudulent character of the experiments pass generally unsuspected. When the reports of Secretary Walcott of the Smithsonian Institution said the “_original_” Langley machine had made “flights,” and when the report of the National Museum said the Langley machine had been flown “without modification,” such statements, untrue though they were, naturally carried weight. Indeed, the misstatements were so widely accepted as fact that they began to find their way into school text-books and into encyclopedias. Griffith Brewer, the English aeronaut, delivered a lecture before the Royal Aeronautical Society in London, in October, 1921, and exposed the fraudulent nature of the Hammondsport tests. In this lecture he mentioned many of the vital changes made in the Langley plane before any attempt was made to fly it. Dr. Walcott made a statement in reply to Brewer. Up to this time Orville Wright had thought that Walcott could have been ignorant of those changes; but after reading the Walcott statement he was convinced that there was nothing accidental or unintentional about the misstatements published by the Smithsonian regarding the tests at Hammondsport.