Elmer's Donkey Pump Engine

In the days of steam, Donkey Pumps were everywhere. They were typically used anywhere we'd use a 1/4 or 1/3 horsepower electric motor today. They were frequently just hung on walls, and supplied oil or water to the machines in use.

Donkey pumps were double acting and very efficient, as the steam drives the pump piston directly.

Currently don't have any available pictures of a donkey pump engine. Anyone know someone who has built one who is willing to share his pics?

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