Air Engines by Theodor Finkelstein

By Theodor Finkelstein

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5 in thick for the regenerator. This regenerator was made of thin wire, which apparently was wound on the displacer body in a spiral fashion with successive layers criss-crossing at right angles until the annular space was nearly filled. The engine was also fitted with a governor which opened a cock near the lower part of the cold space to atmosphere whenever the engine was racing on light load. Although figures for power output of engines dating back to the early nineteenth century are hardly reliable, by some accounts the engine shown in Fig.

However, there is a net force equal to the area of the thick piston rod multiplied by the pressure, and expansion is accommodated by driving the rod out of the cylinder. As the furnace of firebox F is placed inside the main cylinder assembly, while at least some heat is transferred by conduction when valve D closes, one might say that this engine combines features both of external and internal combustion engines and is, therefore, a hybrid between these two types. It is interesting as an engineering curiosity, but as a power producer it probably manages to combine in one model most of the disadvantages that any hot-air engine could and did have.

It proved so successful that by 1860 about 3000 had been sold and were in regular use in many countries, including the United States, England, Germany, France, and Sweden. The appearance of this engine is shown in Fig. 4, which is a photograph of an engine preserved in the Science Museum, London. Ericsson’s own drawing is reproduced in Fig. 5. The main cylinder was closed at one end by the power piston A. Inside, a feed – or transfer – piston F was actuated by a rod passing through the power piston.

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