Roots blower

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Roots blower

[′rüts ‚blō·ər]
(mechanical engineering)
A compressor in which a pair of hourglass-shaped members rotate within a casing to deliver large volumes of gas at relatively low pressure increments.
References in periodicals archive ?
The car -- actually a '69 that filmmakers modified to make look like a '70, featuring a false Roots type supercharger blower above the hood -- is on its way back to Volo all the way from a collector's home in Norway.
George Lewis told Griffith to relax, explaining that he had already spoken to the sponsor of the enlarged program--none other than Jerome Hunsaker--who "was greatly interested and pleased when I told him that the (Army's) DH--4 aircraft with the Roots type supercharger climbed to 20,000 feet in approximately twenty minutes." In exchange for the Navy's patronage, Hunsaker asked Lewis to begin supercharger flight testing on a Davis-Douglas DT-2 airplane equipped with the standard Liberty engine, in order to make a side-by-side comparison with the Army's DH-4 flights.
Roots type supercharger for aircraft engines," concluded the report, "is satisfactory under flight operating conditions and its use enables the realization of greatly improved climbing performance ...