Direct Acting Steam Pump

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“The direct—acting steam pump has the steam piston at one end of a rod and the water position at the other end. The steam pressure acts directly on the piston; no fly light, and there is no revolving mass to carry by the dead points.” —Derr, 1911

Source

Derr, Louis Cyclopedia of Engineering (Chicago, IL: American Technical Society, 1911)

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