File:Humphrey pump, section of valves (Rankin Kennedy, Modern Engines, Vol V).jpg
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![File:Humphrey pump, section of valves (Rankin Kennedy, Modern Engines, Vol V).jpg](https://upload.wikimedia.org/wikipedia/commons/thumb/9/90/Humphrey_pump%2C_section_of_valves_%28Rankin_Kennedy%2C_Modern_Engines%2C_Vol_V%29.jpg/622px-Humphrey_pump%2C_section_of_valves_%28Rankin_Kennedy%2C_Modern_Engines%2C_Vol_V%29.jpg?20130503214525)
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