Toepler pump
noun
Toep·ler pump
ˈteplə(r)-
: 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
Word History
Etymology
after August J.I. Toepler †1912 German physicist, its inventor