air blast

a jet of air produced mechanically.

Origin of air blast

First recorded in 1885–90

An air-blast is injected through the molten mass, and the impurities are burnt, or oxidised as it is chemically termed.

Manures and the principles of manuring |Charles Morton Aikman
An air-blast to cool transformers at main or sub-stations may be provided in either of two ways.

Electric Transmission of Water Power |Alton D. Adams
If cooling with air-blast is adopted, a blower, with electric motor or some other source of power to operate it, must be provided.

Electric Transmission of Water Power |Alton D. Adams
This is prevented by the water-cooled damper S, which always closes the air-blast when the gas-pipe is open and vice versa.

Encyclopaedia Britannica, 11th Edition, Volume 11, Slice 4 |Various

It is customary to convey the air-blast through a pipe leading to the ash-pit, as in the Winterthur apparatus (Fig. 92).

Gas-Engines and Producer-Gas Plants |R. E. Mathot