Part of the scholarly and scientific publications of the United States National Museum series: United States National Museum Bulletin.In these series, the Museum publishes original articles and monographs dealing with the collections and work of its constituent museums— The Museum of Natural History and the Museum of History and Technology. These are gathered in volumes, octavo in size, with the publication date of each paper recorded in the table of contents of the volume. Since 1959, shorter papers relating to the collections and research of that Museum have been gathered in Bulletins titled “Contributions from the Museum of History and Technology,”. The present collection of Contributions, Papers 34-44, comprises Bulletin 240. --The 1893 Duryea automobile in the Museum of History and Technology, by Don H. Berkebile --The Borghesi astronomical clock in the Museum of History and Technology, by Silvio A. Bedini --The engineering contributions of Wendel Bollman, by Robert M. Vogel --Screw-thread cutting by the master-screw method since 1480, by Edwin A. Battison --The earliest electromagnetic instruments, by Robert A. Chipman --Fulton's "steam battery" blockship and catamaran, by Howard I. Chapelle --History of phosphorus, by Eduard Farber --Tunnel engineering, a museum treatment, by Robert M. Vogel --The "Pioneer": light passenger locomotive of 1851 in the Museum of History and Technology, by John H. White --History of the Division of Medical Sciences, by Sami Hamarneh --Development of gravity pendulums in the 19th century, by Victor F. Lenzen and Robert P. Multhauf.