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April, 1923 FIG. 3—LONGITUDINAL SECTION THROUGH A TYPICAL for different shapes of furnaces. A few narrow sections for spacing are used as necessary completely to fill the space, with sufficient clearance, between the end sections. For repairs it is only necessary to remove any one or any number of sections and re- place them by new ones. In a similar way, the supporting work for the sections is divided into parts so that any portion may be re- moved and renewed without disturbing the remainder. Fig. 1 shows a photo- graph of an installation in process, while Fig. 2 shows. the installation complete. Sturrock Furnace Bridge Wall This wall is manufactured by W. W. Booth, 26 Cortland street, New York, and is shown in Figs. 4, 5 and 6. As shown in the longitudinal sec- tion through a furnace, Fig. 5, this wall consists of three major com- ponent parts, the vertical baffle plate, the. base casting and the sections. To give a clear and comprehensive de- scription it is best to consider each major division in order as it is in- stalled. 1.—The vertical baffle plate of cast iron is placed transversely in the fur- mace. It is cast in the shape of a segment of a circle and conforms to the shape of the furnace. Angle lugs cast in the baffle at its lower center tend to steady it in a corruga- tion. The top of the haffle plate forms a seat and support for the base casting and in this manner distrib- MARINE REVIEW utes the weight of the wall uniformly to the lower half of the furnace. 2.—A base casting placed horizontal- ly extends across the width of the furnace and rests on ‘and is bolted to the vertical baffle plate. The ends of the base casting are shaped. to fit into and conform to the corrugations in the furnace at the sides, thus prevent- ing any longitudinal shifting and forming a bracket brace for the verti- cal baffle plate... A beveled or hooked shape is given the front of the bases casting as conditions may require, to carry the inner ends of the grate bars. Near the rear of -the base casting 163 AWRAWBAABeBaaaaneea FURNACE, SHOWING FURNACE BRIDGE WALL IN PLACE there is a transverse vertical pro- jection or rib on which the sections hook on and are locked in place. 3.4Fig. 6 illustrates one of the standard sections which goes to make up the bridge wall proper. These flat triangular sections are placed side by side for the full width of the fur- nace with their bottom surfaces rest- ing on the horizontal surface of the casting. The rear leg of the section at the base has a U-shaped opening which hooks over the vertical rib on the base casting, thus locking the section in place though not interfering with the necessary play for contraction or FIG. 4—EXCELLENT CONDITION OF A FURNACE BRIDGE WALL OF THE TYPE SHOWN IN FIGS. 5 AND 6 AFTER TWO AND ONE-HALF YEARS OF SERVICE