. The railroad and engineering journal . r pass-ing through a ballle-plate, enters the dry-pipe J leading of the manifold, nipples are placed alternately on differentdiameters, so that the nipples of one row come opposite thespaces between the nipples of the other row. Into thesenipples the lower ends of the two rows of vertical tubes,forming the sides of the furnace, are secured by screw-couplings. The upper inds of the tubes are secured intonipples, cast on the central drum, by screw-couplings, inthe same manner as the lower ends. C)wing to the smallcircumference presented by the central dru
. The railroad and engineering journal . r pass-ing through a ballle-plate, enters the dry-pipe J leading of the manifold, nipples are placed alternately on differentdiameters, so that the nipples of one row come opposite thespaces between the nipples of the other row. Into thesenipples the lower ends of the two rows of vertical tubes,forming the sides of the furnace, are secured by screw-couplings. The upper inds of the tubes are secured intonipples, cast on the central drum, by screw-couplings, inthe same manner as the lower ends. C)wing to the smallcircumference presented by the central drum, there is notsufficient space for it to receive the tubes of the same rosvon the same horizontal plane ; accordingly, each alternatetube of each row enters the drum on a lower plane thanthe remaining tubes. The central drum consists of two portions, namely, thelower, filled with water, and the upper, filled with steam, theupper portion being a vertical extension of the are cylindrical, and have their axes in the same verti-. THE TOWNE BOILER. to the stop-valve. Any water entering the drum with thesteam falls again and completes the circuit. In this boiler every individual piece is free to expand andcontract independent of any other. By removing the top of the boiler casing and the uppermanifold /, any of the nests of tubes may be raiseil out ofthe jacket for examination or repairs. THE \V.\RD LAUNCH This boiler, shown in fig. 12, has recently been fitted tosome of our navy launches, and is also in general forma vertical cylinder, but is radically different in its generalarrangement of pipes from that of the large Ward boiler. From a horizontal annular manifold, a double row ofsmall water tubes rises vertical 3 ft. to 6 ft., accordingto the size of the boiler, and then taking an easy sweep of90°, enters a central drum. In oriler to form the furnacedoor, a rectangular, hollow, vertical projection is castupon the upper semi-circumference of the manifold. The
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Keywords: ., bookcentury1800, bookdecade1880, booksubjectrailroa, bookyear1887
