Definition of "exhauster"

One of the most insignificant-looking men I ever saw then became the destroyer of nations, the leveller of mountains, the exhauster of the ocean.

1916, R. V. Russell, The Tribes and Castes of the Central Provinces of India‎

There is, however, another inconvenience which can only be remedied by the use of a second exhauster, viz., the loss of pressure after the passage of the gas through the washer--a loss resulting from the obstacle presented by this appliance to the steady flow of the gas.

1884, Various, Scientific American Supplement, No. 446, July 19, 1884‎

The Westinghouse type CM.38 air compressor is mounted under the main frame and the Northey rotary type exhausters are fitted one on each side of the platform at No. 1 end; [...].

1962 December, “The B.R. standard diesel-electric Type 1 locomotive”, in Modern Railways, page 381