. American engineer and railroad journal . ther supported on water tubes or studs. In connection with the hollow main arch are the door archesshown in Fig. 18, air being admitted over the door through two2-inch ferrules or air inlets; the main air arch has two air inletsof two J^-inch ferrules. Two types of arches for long fire boxesare shown in Figs. 19 and 20, used in connection with the crownarches placed adjacent to the crown sheet and, being hollow,the air is admitted through the ferrule in the side sheets. InFig. 19, the air for the main arch is taken through the throatsheets, and in Fig
. American engineer and railroad journal . ther supported on water tubes or studs. In connection with the hollow main arch are the door archesshown in Fig. 18, air being admitted over the door through two2-inch ferrules or air inlets; the main air arch has two air inletsof two J^-inch ferrules. Two types of arches for long fire boxesare shown in Figs. 19 and 20, used in connection with the crownarches placed adjacent to the crown sheet and, being hollow,the air is admitted through the ferrule in the side sheets. InFig. 19, the air for the main arch is taken through the throatsheets, and in Fig. 20 the arch is set back 18 inches from the fluesheet. This space is bricked in on top_ of the grate. This is avery shallow fire box: there is no room for the usual construc-tion of arch. By this construction is formed the combustionchamber, which cuts off a portion of the grate area, resulting incombination with the crown arch, of a very efficient arch con-struction. Air is admitted to the arch from the ash pan in thisparticular Fig. 13. August, ioos. AMERICAN EXGIXEER AND RAILROAD JOURNAL. 309
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Keywords: ., bookcentury1800, bookdecade1890, booksubjectrailroadengineering
