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Root's Positive Blower

The internal operating parts of this positive blower consist of two revolvers, each of which is operative. Externally the blower consists of the case, four journals and journal-boxes, four cut gears, an oil-tight housing, and two driving-pulleys. This blower operates by a regular displacement of air at each revolution, whether it runs fast or slow. When the air enters the case at the opening for induction, and is closed in by the wings of the revolvers, it is absolutely confined, and positively forced forward until brought to the education-pipe, where it must be discharged, or the machine stop, if perfectly tight, as there can be no backward escapement of the air after it once enters the case, the contact being kept up at all times in the centre of the blower between the pistons or revolvers, thus preventing any escape of the air in that direction. See BLOWER; BLAST.