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Fire Has New Enemy Traveling "foam plugs" have controlled six out of nine fires (above) started by the U. S. Bureau of Mines in an experimental coal mine near Bruceton, Pa. Bureau researchers are evaluating the method* originated by the British, for use in American coal mines. So far, they've concluded that fires "of moderate size and intensity'* can be brought to heel by foam plugs made several hundred feet away, according to the bureau's Report of Investigations 5419. Foaming compounds are dissolved in water, which is sprayed on a cotton screen stretched across the mine tunnel. The ventilating system carries the resulting foam (right center) to the fire, where its coutained water vaporizes, lowering the temperature and subduing the flames (bottom right). The bureau has used foams made with four different brands of foaming agents; some contained stabilizers. Bureau researchers made one plug 1600 feet long, but the foam -front contained so little water that it would have been next t o useless- Plugs can move quite a distance on their errand, however; one of them traveled more than 1000 feet through the Bruceton mine to put out a fire. The plugs may also prove useful in cooling off larger fires so men can get close enough to use other fire fighting agents.
