Sponge Iron and Direct-iron Processes, Issues 519-525

120 feet wide adjoining barrier pillar anthracite Bear Ridge bed is unmined BED The portion Bed thickness feet Beds in stratigraphic Bottom Split Buck Mountain bed Bureau of Mines carbon charge coke considered effective cyclopropane dam for pool discharge dolomite east by barrier effective altitude effective below altitude encroachment first-mined and partly first-mined and robbed floor furnace gases Gilberton glomerules heat hematite Holmes bed hydrogen inches iron oxide level of pool Lykens Valley magnetite Mammoth bed material megohms metallic iron method mined near barrier Minimum altitude Minimum barrier-pillar mixture Name of bed north dip operating oxygen partly robbed percent portion of barrier pounds Reading Coal reducing agent resistance rotary kiln rubber saggers samples sequence and names Seven Foot side to altitude south dip sponge iron static electricity steel stratigraphic sequence sulfur Tahawus temperature tests tion Top Split tunnel kiln water level wide and intact William Penn