. Bulletin - United States National Museum. Science. SYLPH CYCLES SSS-. Figure 5.—Advertisement of Duryea bicycle company, Scientific American, September g, 1893. powered carriages he had read of earlier came con- stantly into his mind in these periods of He and Frank studied several books on gasoline engines, among them one by an English writer (title and author now unknown);5 this described the Otto 4-stroke cycle as now used. Some engineers, however, were concerned because this engine, on the completion of the exhaust stroke, had not entirely evacuated all of the products of comb
. Bulletin - United States National Museum. Science. SYLPH CYCLES SSS-. Figure 5.—Advertisement of Duryea bicycle company, Scientific American, September g, 1893. powered carriages he had read of earlier came con- stantly into his mind in these periods of He and Frank studied several books on gasoline engines, among them one by an English writer (title and author now unknown);5 this described the Otto 4-stroke cycle as now used. Some engineers, however, were concerned because this engine, on the completion of the exhaust stroke, had not entirely evacuated all of the products of combustion. The Atkinson engine, patented in 1887, was one of the attempts to solve this as well as several other problems, thus creating a more efficient cycle. This engine was designed so that the exhaust stroke carried the piston all the way to the head of the engine, while the compression stroke only moved the piston far enough to sufficiently compress the mixture. The unusual linkage necessary to create these unequal strokes in the Atkinson engine made it seem impractical for a carriage engine, where compactness was desired. Going to Hartford, Connecticut, possibly on business relating to his bicycle work, Charles visited the Hartford Machine Screw Company where the Daimler-type engine was being produced,6 but after examining it he felt it was too heavy and clumsy for his purpose. Also in Hartford he talked over the problem of a satisfactory engine with C. E. Hawley, an employee of the Pope Manufacturing Company, makers of the Columbia bicycle. Hawley, searching for a way to construct an engine that would perform in a manner similar to the Atkinson, yet would have the lightness and compactness necessary for a carriage engine, suggested an idea that Charles believed had some merit. This idea, involving the use of what the. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of t
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