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The D.C. & U.

A Gas/Steam Convertible Engine for the Oil Field

By Bill Tremel

This D.C. & U. was photographed in 1964, probably somewhere near McDonald, Pa., and likely when the engine was pulled from service.

An early ad for a Tillinghast-built D.C. & U. convertible cylinder.

This particular cylinder caught my interest while working with Joe Prinzinger on a historical document of the B.D. Tillinghast Machine Shop (see page 25 of this issue for the full history) in McDonald, Pa. While the D.C. & U. engine cylinder was one of the products that Tillinghast built, it was not of his own design. Tillinghast was the sole producer in building this unique and apparently once popular engine cylinder, and the patent rights belonged to three other individuals, Gustave Dahlberg, Jacob Clicquennoi and Ernest Uhlin. These three gentlemen all lived in th...

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