The First Man-Carrying Aeroplane Capable of Sustained Free Flight: Langley's Success as a Pioneer in Aviation From the Smithsonian Report for 1914, pages 217-222, Publication 2329, 1915

"The First Man-Carrying Aeroplane Capable of Sustained Free Flight: Langley's Success as a Pioneer in Aviation" by Albert Francis Zahm is a recount of Dr. Samuel Langley's groundbreaking work in aviation, highlighting his struggles and triumphs in designing an aeroplane capable of sustained flight. The story traces Langley's journey through his early experiments with model aeroplanes, powered by both steam and gasoline, showcasing his deep understanding of aerodynamics. The publication discusses the obstacles Langley faced, including a disheartening accident in 1903 that temporarily overshadowed his achievements. It later describes how, in 1914, Langley's designs were revived and successfully flown under the guidance of Glenn H. Curtiss, reaffirming Langley's place as a visionary and major contributor to the birth of aviation.