emoved from a steel casting in 4 minutes with 40 machine shops, ship yards, and other establishments. or rather burned, through by the oxygen, the tem- cents' worth of gas. A sinkhead 1% inches thick and perature being raised to 1,300 or 1,400 deg. F. by the The oxyhydrogen nozzle of the oxhydric… … first time to employ costs two cents and picture postal cards The Metal-Catting Equipment Cutting a Steel Beam. hydrogen two-thirds as means of instruc- of a cent per cubic tion in the schools. The post card indus- foot, the cost of cut- ting an iron plate try has made enor- 4/5 inch thick is mous…
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