Science: Homemade Gas Masks

An emergency gas mask that can be made at home was demonstrated in Manhattan last week by the American Women's Voluntary Services. The necessary materials can be found in almost any house: a bathing cap, a small tin can, the transparent cover from a powder-puff box, a bit of wire net (from fly swatters), two handkerchiefs, elastic ribbon, adhesive tape, and (from the drugstore) a few ounces of activated coconut charcoal and soda lime. The principle behind the homemade mask is simple; the assembly is more difficult. The rubber cap is fitted snugly over the face and two holes are cut...

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