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.
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General PhysicsSource
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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