The paper presents descriptions of a new type of steam engine and a forced-circulation boiler which were designed by Mr. Knox and tested by Professor Yellott. The engine has a maximum capacity of 90 hp and is a high-speed compound reversible unit with uniflow exhaust. The description relates particularly to the unusual features of the inlet valves. The boiler employs a new principle for obtaining forced circulation. An impeller placed longitudinally in a lower drum exerts a pumping action which results in a uniform and rapid circulation through a number of riser tubes which comprise the walls of the combustion chamber. The paper is presented as a progress report. It is the authors’ purpose by this means to present new and improved ways of accomplishing familiar ends, rather than to give an exhaustive discussion of the development of the particular units involved.

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