In Cleveland's Public Hall last week, some 10,000 members of the American Mining Congress swarmed about huge machines that held the hope of new life for the dying coal industry. The metal monsters, along with sketches and pictures of others too huge to bring into the hall, promised dramatic cuts in mining costs all along the line.
Among eye-catchers:
¶Joy Manufacturing Co.'s 40-ton continuous coal miner that can eat into a coal seam at the rate of 4½ feet per minute, mine eight tons of coal in the same time (see cut). Two boring arms bite into the coal, cut it...
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