Popular Science Monthly

��327

��In the illustration below may be seen one of the many trestles which carry gaspipes across a torn-up street. After one serious explosion, New York put these pipes in the air where leaking gas would escape without danger of a catastrophe. The average cost of doing this is twenty-five hun- dred dollars; and where larger distribution mains must be han- dled, the cost runs as high as ten or eleven thousand dollars

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