Ericsson Caloric Engine, c. 1869

Ericsson's hot air (Caloric) engine, c. 1869, about 1 h.p., patented 1855, 15" diameter cylinder; piston stroke 6.75".

This is a hot-air engine of the open cycle type in which air is admitted, compressed, heated and exhausted. It was patented in 1855 by John Ericsson, who had worked on the subject since 1825, had patented his first engine in 1833, and in 1852 had built some very large engines for ship propulsion with cylinders 14 ft. diam. The engine shown was made about 1869, and remained in use 30 years.