. Transactions. Fig. 2.—General Plan of Twin Ladle-Pit and Spout for Open-Hearth xliv.—16 254 DEVELOPMENTS IN OPEN-HEARTH DEVELOPMENTS IN OPEN-IIEARTH STEEL-PRACTICE, 255 that the checker-space on each end of the furnace is only equal toabout 15 cu. ft. per ton of hearth-capacity; or, one-sixth of theamount generally allowed and recommended by prominentmetallurgists. This stateme;it is not made from any desire tocriticise or detract from the prevailing views and practice; butit might be worth while to note that, had this practice been

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Keywords: ., bo, bookcentury1800, bookdecade1870, booksubjectmineralindustries