A circulating pump designed to give a constant rate of flow of gases, even at sub-atmospheric pressures, is described. The pumping mechanism consists of a reciprocating piston in a cylinder driven at a constant linear speed. The valves in a double-acting valve system have been made ``weightless'' by the use of solenoids. Mercury is used as a displacement fluid.
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Shapiro et al. (1955) studied this question.
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