Science: New Job for Pores

An entirely new method of filtering gases and liquids-—a simple, cheap, quick way to separate air from water, water from oil, etc.—was announced last week by Selas Co., a Philadelphia engineering firm that has fathered many another useful recent invention.* Its industrial possibilities are so far-reaching that the discovery may prove as significant as invention of the sieve, the basis of all mechanical filters.

Its discoverer is a young Selas physical chemist named John M. Walker. He has astonished engineers with some of his demonstrations: e.g., he pours a mixture of kerosene and water into a tube; the liquid comes out rapidly...

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