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Vo-lute′--wheel.

A volute-shaped shell, that in revolving presents its open mouth to the air, which is thus gathered into the tube and discharged through the hollow axis. It is a common and effective form of blower.

The term volute-wheel is sometimes applied to a water-wheel with radial or curved buckets, in which the periphery of the wheel is surrounded by a volute-shaped casing or scroll, which confines the water against the wheel, gradually decreasing in capacity as it encircles the wheel.

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