Description: |
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. |