I03. Root's Blower Chamber Wheel Mechanism
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This device was first exhibited by Root at the 1867 Paris Exhibition. The wheels were about three feet in diameter and seven feet long, and delivered a large volume of air at a considerable pressure when driven at high velocity. It was, however, used as early as 1859 as a gas exhauster by G. Jones of Birmingham, England.

Outer lobe profiles are circular in section, and in air delivery work a slight clearance is maintained between mating surfaces to eliminate friction.

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