Identifier: bulletinunitedst2101956unit (find matches)
Title: Bulletin - United States National Museum
Year: 1877 (1870s)
Authors: United States National Museum Smithsonian Institution United States. Dept. of the Interior
Subjects: Science
Publisher: Washington : Smithsonian Institution Press, (etc.) for sale by the Supt. of Docs., U.S. Govt Print. Off.
Contributing Library: Smithsonian Libraries
Digitizing Sponsor: Smithsonian Libraries

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is located thererather than on the floor of the machine as in the replica andthe other models. Peter Cooper, the New York engineer andinventor who constructed the original Tom Thumb as an ex-periment in the winter of 1829-1830, mentioned this upperlocation of the blower in a speech delivered many years later,in 1875, and quoted in Bulletin 73 of the Railway andLocomotive Historical Society (1948, pp. 50-52). The little locomotive, with its vertical boiler made of riflebarrels, looked rather like the larger locomotive of JohnStevens of only several years earlier but had considerablysmaller wheels, these being only 30 inches in diameter. Although a 3V4-inch bore for its vertical 1-cylinder engineis given by most writers, Jonathan Knight, chief engineer ofthe Baltimore and Ohio, in the fourth annual report of thecompany (for 1830, p. 35) gives the figure as 3^2. Unfortu-nately, he does not mention the stroke, which is usuallygiven elsewhere as either 14y4 or 14^2 inches. The bore and 22
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Figure 1 5. — Full sized operable replica of Coopers Tom Thumb, built in 1 926by Baltimore and Ohio Railroad Co. Figure 16.—Model of Tom Thumb, in National Museum.

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