Double-barrelled Air-pump

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Two racks carry the pistons and work with the pinion. The pinion is turned by a double-handed lever, which is moved alternately in opposite directions.

Source

A. Privat Deschanel Elementary Treatise on Natural Philosophy Part I. Mechanics, Hydrostatics, and Pneumatics (New York: D. Appleton and Company, 1884) 182

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