If cooling with air-blast is adopted, a blower, with electric motor or some other source of power to operate it, must be provided.
Build water-wheel and fan-wheel, and set my machinery for an air-blast to reduce the ore.
This is prevented by the water-cooled damper S, which always closes the air-blast when the gas-pipe is open and vice versa.
It is customary to convey the air-blast through a pipe leading to the ash-pit, as in the Winterthur apparatus (Fig. 92).
Either of the two systems can be operated under pressure with an air-blast, in which case a gas-holder and bell must be employed.
An air-blast is injected through the molten mass, and the impurities are burnt, or oxidised as it is chemically termed.
Curved windshields of heavy glass protected the passengers from the air-blast of swift motion.
An air-blast to cool transformers at main or sub-stations may be provided in either of two ways.
Besides this mild climate, air-blast transformers add to the favorable features in the stations having the twelve-inch openings.