RECONSTRUCTING THE PLANS 161 APPENDIX 167 FOOTNOTES _Howard I. Chapelle_ FULTON'S "STEAM BATTERY": BLOCKSHIP and CATAMARAN [Illustration: Figure 1.--SCALE MODEL of Fulton's _Steam Battery_ in the Museum of History and Technology. (Smithsonian photo P-63390-F.)] _Robert Fulton's "Steam Battery," a catamaran-type blockship, was built during the War of 1812. Until recently, not enough material has been available to permit a reasonably accurate reconstruction of what is generally acknowledged to be the first steam man-of-war._ _With the discovery, in the Danish Royal Archives at Copenhagen, of plans of this vessel, it is now possible to prepare a reconstruction and to build a model._ _This article summarizes the history of the vessel, describes the plans and the reconstruction, and also evaluates its design with particular attention to the double-hull construction._ THE AUTHOR: _Howard I. Chapelle is curator of transportation in the Smithsonian Institution's Museum of History and Technology._ The identity of the first steam man-of-war has been known for many years, and a great deal has been written and published on the history of this American vessel. Until recently, the only available drawing of the ship has been a patent drawing made for Robert Fulton. This does not comply with contemporary descriptions of the steamer and the drawing or plan is out of proportion with the known dimensions. The lack of plans has heretofore made it impossible to illustrate the vessel with any degree of precision, or to build a scale model. The discovery in 1960 of some of the plans of this historic ship in the Danish Royal Archives at Copenhagen now makes possible a reasonably accurate reconstruction of the vessel and also clarifies some of the incomplete and often confusing descriptions by contemporary writers. Of the numerous published accounts of the ship that are available, the most complete is David B. Tyler's "Fulton's Steam Frigate."[1] A contemporary description of the vessel by the British Minister to Washington, 1820-23, Stratford Canning, was published by Arthur J. May.[2] In _Naval and Mail Steamers of the United States_, by Charles B. Stuart,[3] and _The Steam Navy of the United States_, by Frank M. Bennett,[4] the history of the ship and some descriptive facts are given. Stuart, in an appendix, gives in full the report of the Supervisory Committee (set up to administer the building contract). Tyler and Stuart, and the Committee Report are the principal sources from which the following summary of the ship's history is drawn. [Text of Illustration: Plate N^o. 1. "DEMOLOGOS"