toepler pump

\\ˈteplə(r)-\ noun

Usage: usually capitalized T

Etymology: after August J.I. Toepler died 1912 German physicist, its inventor

: a gas pump that is used to produce vacuums or to transfer gases from one part of a system to another and that operates by the alternate lowering and raising of a column of mercury with the consequent alternate production of a vacuum in one tube and the exhausting of the gas through another