Produced by Chris Curnow, Joe Cooper, Christine P. Travers and the Online Distributed Proofreading Team at http://www.pgdp.net SERIAL PUBLICATIONS OF THE SMITHSONIAN INSTITUTION The emphasis upon publications as a means of diffusing knowledge was expressed by the first Secretary of the Smithsonian Institution. In his formal plan for the Institution, Joseph Henry articulated a program that included the following statement: "It is proposed to publish a series of reports, giving an account of the new discoveries in science, and of the changes made from year to year in all branches of knowledge not strictly professional." This keynote of basic research has been adhered to over the years in the issuance of thousands of titles in serial publications under the Smithsonian imprint, commencing with _Smithsonian Contributions to Knowledge_ in 1848 and continuing with the following active series: _Smithsonian Annals of Flight_ _Smithsonian Contributions to Anthropology_ _Smithsonian Contributions to Astrophysics_ _Smithsonian Contributions to Botany_ _Smithsonian Contributions to the Earth Sciences_ _Smithsonian Contributions to Paleobiology_ _Smithsonian Contributions to Zoology_ _Smithsonian Studies in History and Technology_ In these series, the Institution publishes original articles and monographs dealing with the research and collections of its several museums and offices and of professional colleagues at other institutions of learning. These papers report newly acquired facts, synoptic interpretations of data, or original theory in specialized fields. Each publication is distributed by mailing lists to libraries, laboratories, institutes, and interested specialists throughout the world. Individual copies may be obtained from the Smithsonian Institution Press as long as stocks are available. S. DILLON RIPLEY _Secretary_ Smithsonian Institution The Wright Brothers' Engines And Their Design [Illustration: Kitty Hawk Flyer with original Wright engine poised on launching rail at Kill Devil Hill, near Kitty Hawk, North Carolina, 24 November 1903, the month before the Wrights achieved man's first powered and controlled flight in a heavier-than-air craft.] [Illustration: Reproduction of the first engine, built by Pratt & Whitney, as displayed in Wright Brothers National Memorial at Kitty Hawk. Engine is mounted in a reproduction of the Wrights' Flyer built by the National Capital Section of the Institute of the Aeronautical Sciences (now the American Institute of Aeronautics and Astronautics). Engine and plane were donated in 1963 to the National Park Service Cape Hatteras National Seashore.] SMITHSONIAN ANNALS OF FLIGHT * NUMBER 5 SMITHSONIAN INSTITUTION * NATIONAL AIR AND SPACE MUSEUM The Wright Brothers' Engines And Their Design