Figure 8. — Two versions of Ericsson's caloric engine, 1833. The same elements 

 as used in the later engines — compressor, heater, regenerator, and working 

 cylinder — are present in this earlier version of the caloric engine, designed while 

 John Ericsson was in England. Aside from unsolved problems of lubrication, 

 this engine, like others built by Ericsson, was promising so long as actual 

 performance tests were not made. (Top, reproduced from wood engraving in 

 Scientific American, Jan. 29, 1853, vol. 8, p. 153. Bottom, from Mechanics' 

 Magazine, London, Nov. 9, 1833, vol. 20, p. 81.) 



56 



BULLETIN 228: CONTRIBUTIONS FROM THE MUSEUM OF HISTORY AND TECHNOLOGY 



