Secretary D. H. Killeffer of the New York section of the American Chemical Society last week helped the lay public to catch up with a notable advance in commercial refrigeration. He described the properties and uses of "dry ice," as this commercial solid carbon dioxide is called from the fact that it forms a gas instead of a liquid when it melts. U. S. manufacturers, said Secretary Killeffer, had now perfected "dry ice," a practical portable refrigerant, and brought it into wide use. For shipping ice cream it was 1500% more efficient...
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