The Americana; a universal reference library, comprising the arts and sciences, literature, history, biography, geography, commerce, etc., of the world . he ore and lime are added at certain intervalsto make the overflow of slag continuous untilthe desired stage of purification is reached. Next in importance is the Talbot Process,also conducted in a basic lined open hearth steelfurnace. Ihe furnace for this process is ofmovable type and is so constructed that thebody can be tilted forward to discharge the bathof metal through an opening placed at the levelof the bath, or it can be moved in the
The Americana; a universal reference library, comprising the arts and sciences, literature, history, biography, geography, commerce, etc., of the world . he ore and lime are added at certain intervalsto make the overflow of slag continuous untilthe desired stage of purification is reached. Next in importance is the Talbot Process,also conducted in a basic lined open hearth steelfurnace. Ihe furnace for this process is ofmovable type and is so constructed that thebody can be tilted forward to discharge the bathof metal through an opening placed at the levelof the bath, or it can be moved in the oppositedirection to pour out of suitable openingsplaced at a higher point greater or lessquantities of the slag. The process is a con-tinuous one. A full charge of metal whichmay consist of molten pig-iron direct from theblast furnace, or a of pig-iron and steelscrap is treated by additions of iron ore andlime until proper pre-determined conditions arereached by slag action. At that stage aliout onehalf of the refined charge is withdrawn into aladle allowing the balance to remain in the fur-nace. At this point another addition of impure. Elevation Through Open-Hearth Furnace, ShowingCharger and Casting Crane. molten pig-iron is poured into the furnace insufficient quantity to equal the initial remaining slag is then removed by furnace, a fresh one made by ore and limeand the refining operation repeated. In thesecond treatment, however, the interval of timeis considerably reduced because the residue ofrefined metal from the initial charge greatly di- VoL. I.(—46 lutes tile succeeding addition of molten impurestock and so making a smaller total of objec-tionable elements to remove by slag normal conditions the furnace is neverempty excepting at week ends when incidentalrepairs are made. In regular open hearth prac-tice the furnace is emptied completely at theend of each heat. It is then patched up, as maybe necessary, a
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