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 ![Valves of Steam-Powered Pumping Engine](/sites/g/files/omnuum6316/files/chsi/files/leavitt_engine.png)

 

**Main Valves of Steam-Powered Pumping Engine**  
  
**This is one of several hundred sheets depicting every piece of the “Ontario” steam-powered pumping engine, designed by Erasmus Darwin Leavitt, Jr. for a copper mine on the shores of Lake Superior. Detailed, annotated drawings allowed engineers and machinists to communicate about complicated machines like this engine.**  
  
 **CHSI Inv. Number 6908b  
circa 1875  
Erasmus Darwin Leavitt, Jr.**