Nicholas Roosevelt (inventor) 74-gun ships. In 1797, with Robert R. Livingston and John Stevens, he agreed to build a boat on joint account, for which the engines were to be constructed by Roosevelt, and the propelling agency was to be that planned by Livingston. The experiment failed, the speed attained being only equivalent to about in still water. On September 6, 1798, Roosevelt described and earnestly recommended to Livingston a vertical wheel, which is the first practical suggestion of the combination that made steam navigation a commercial success, although four years later Robert Fulton believed that chains and floats were alone to be
Live steam the locomotive and is hence a genuine "steam" locomotive. It is technically possible to build even smaller operating steam engines. Hand-made examples, as small as Z scale (1:220), with a gauge of only , have been produced. These are fired with a butane flame from a burner in the engine's tender. AA Sherwood of Australia, an engineering lecturer, produced some miniature scale model live steam engines in the late 1960s and early 1970s. His smallest live steam engines were 1:240 scale which is smaller than the 1:220 of Z Scale. The smallest scale Sherwood worked in was 1:480, though that