Illuminating gas engineers were amazed last week. They could not account for the explosion in Pittsburgh of a gas storage tank said to be the largest in the world. Supposedly, it was empty; workmen were repairing its top. Suddenly, unaccountably, the tank, capable of holding 5,000,000 cu. ft. of gas, blew up. It caused two lesser (and full) gas tanks to explode; it blew buildings apart; it killed some two dozen people, injured several hundred.
Many large U. S. cities have similar tanks within the corporate limits. New York tanks contain enough gas for 15...
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