. Steel rails; their history, properties, strength and manufacture, with notes on the principles of rolling stock and track design . qualityand amount of fuel, charge, working of furnace, etc., the currents of gas andair are reversed, now entering the furnace at the opposite ends and havingpassed through the checker chambers, heated up during the previous period,take this stored-up heat to create a more intense flame over the bath. Thesewaste gases in turn pass out through the chambers, giving up their heat. Thisreversal is maintained with regularity until the charge is ready to tap. Fig. 260
. Steel rails; their history, properties, strength and manufacture, with notes on the principles of rolling stock and track design . qualityand amount of fuel, charge, working of furnace, etc., the currents of gas andair are reversed, now entering the furnace at the opposite ends and havingpassed through the checker chambers, heated up during the previous period,take this stored-up heat to create a more intense flame over the bath. Thesewaste gases in turn pass out through the chambers, giving up their heat. Thisreversal is maintained with regularity until the charge is ready to tap. Fig. 260 illustrates the general arrangement of an open hearth plant. The Talbot continuous open-hearth process employs a tilting furnacewhich may be operated at a capacity of from 20 tons upward; 100 to 150 oreven 200 tons are entirely practicable. The charge is run in from the cupola, * A Study of the Open Hearth, Harbison-Walker Refractories Company, Pittsburg, 1909. 376 STEEL RAILS blast furnace, or mixer, desiliconized wholly and decarbonized largely by ablanket of slag rich in oxides, and reduced ultimately in the usual way. The. GAS TRANSVERSE SECTION OF LONGITUDINAL SECTION AT TRANSVERSE SECTION AT REGENERATIVE CHAMBERS CENTER LINE OF FURNACE CENTER LINE OF FURNACE Fig. 259. — Modern Open-hearth Furnace. (Harbison-Walker Refractories Co.) charge is run off and its place supplied by a new charge, the bottom being atno time allowed to become exposed. INFLUENCE OF DETAIL OF MANUFACTURE 377 Figs. 261 and 262 show tilting open-hearth furnaces. Fig. 261 shows aWellman tilting open-hearth furnace and Fig. 262 was taken at the Jones and
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