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Vacuum ejector
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A vacuum ejector, or simply ejector is a type of vacuum pump, which produces vacuum by means of the Venturi effect.
A brass aspirator. The water inlet and outlet are at the top and bottom, respectively; the air inlet is on the side.
A brass aspirator. The water inlet and outlet are at the top and bottom, respectively; the air inlet is on the side.
Vacuum pump
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A vacuum pump is a type of pump device that draws gas particles from a sealed volume in order to leave behind a partial vacuum. The first vacuum pump was invented in 1650 by Otto von Guericke, and was preceded by the suction pump, which dates to antiquity.
Student of Smolny Institute Catherine Molchanova with vacuum pump, by Dmitry Levitzky, 1776
Student of Smolny Institute Catherine Molchanova with vacuum pump, by Dmitry Levitzky, 1776
A cutaway view of a turbomolecular high vacuum pump
A cutaway view of a turbomolecular high vacuum pump