Toepler pump

A Toepler pump is a form of mercury piston pump,[1][2] invented by August Toepler in 1850.

When G is raised, mercury rises in tube F and cuts off the gas in B and T at C. This gas is then forced through the mercury in tube D into the atmosphere.

The end of tube D is bent upward at E to facilitate collection of gas (or vapor).

By alternately raising G, a pumping action results.

Clearly tubes F and D must be long enough to support mercury columns corresponding to atmospheric pressure (76 cm at sea level).