The U.S. Steel Corp. and the U.S. Army last week tested the first smoke blackout in U.S. history. Stage for the show was the huge Carnegie-Illinois mill (U.S. Steel subsidiary) in Gary, Ind. As Army engineers and civilians watched, a black smoke belched from 20 furnace stacks and from 20 locomotives crisscrossing the mill yard. Soon the plant was hidden under a black smoke umbrella (see cut).
Although it looked good from the ground, the half-hour test was called only "25% successful" because a breeze came up and blew the smoke away. Gary...
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