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“A device for raising liquids or removing gas from a closed vessel.” Foster, 1921. The image shows two types of pumps and their mechanisms: Fig. 1; a. barrel, b. piston, c. valve, d. reservoirs. Fig. 2; a. barrel, b. piston, c. valve in barrel, d. valve in stand pipe, e. reservoir, f. air chamber.


Fluid Pumps


Ellsworth D. Foster ed. The American Educator (vol. 6) (Chicago, IL: Ralph Durham Company, 1921)


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